failed to power on bluetooth (kobo)

[tartanpion]

Tested with 0.15.7 same problem.
Turning on Bluetooth in Kobo beforehand doesn't make any difference.

i can enable the debug log if you want
=== Audiobook Read-Along Bug Report (v0.1.5.6) ===
Generated: 2026-03-26T11:25:41Z
Method: generate-report.sh (standalone)

── Device ──
  platform: kobo
  model: io
io
  arch: armv7l
  uname: Linux kobo 4.1.15-00868-g58a2758be07 #106 SMP PREEMPT Thu Aug 7 08:28:07 Asia 2025 armv7l GNU/Linux

── KOReader ──
  koreader_version: v2026.03-22-g530ee8ab9_2026-03-25

── Plugin ──
  plugin_version: 0.1.5.6
  plugin_dir: /mnt/onboard/.adds/koreader/plugins/audiobook.koplugin
  has_bundled_espeak: yes
  has_bundled_piper: yes
  piper_models: fr_FR-upmc-medium.onnx

── Plugin Settings ──
  (not available -- requires KOReader runtime)

── Audio & TTS ──
  tts_in_path:
    (none found)  players_in_path:
    aplay: /bin/aplay
    gst-launch-1.0: /bin/gst-launch-1.0  alsa_cards: --- no soundcards ---
  bt_available: yes
  gst_bt_sink: not found
  tmp_writable: yes

── Resources ──
  meminfo:
    MemTotal:         507600 kB
    MemFree:          310428 kB
    MemAvailable:     380932 kB
    Buffers:            8912 kB
    Cached:            81040 kB
  disk_tmp: none                    247.9M     36.0K    247.8M   0% /tmp

=== End of Bug Report ===

There's no sound, but I tried launching it from a word—it seems to work.

---------------------------------------------
                launching...
  _  _____  ____                _
 | |/ / _ \|  _ \ ___  __ _  __| | ___ _ __
 | ' / | | | |_) / _ \/ _` |/ _` |/ _ \ '__|
 | . \ |_| |  _ <  __/ (_| | (_| |  __/ |
 |_|\_\___/|_| \_\___|\__,_|\__,_|\___|_|

 It's a scroll... It's a codex... It's KOReader!

 [*] Current time: 03/26/26-12:22:48
has monolibtic? no (libs/libkoreader-monolibtic.so: cannot open shared object file: No such file or directory)
lib_search_path: libs/?
lib_basic_format: lib%s.so
lib_version_format: lib%s.so.%s
 [*] Version: v2026.03-22-g530ee8ab9_2026-03-25

ffi.load: rt.so.1 (RTLD_GLOBAL)
ffi.findlib: utf8proc [3]
ffi.load: libs/libutf8proc.so.3
ffi.findlib: blitbuffer
ffi.load: libs/libblitbuffer.so
ffi.findlib: archive [13]
ffi.load: libs/libarchive.so.13
ffi.findlib: fbink_input [1]
ffi.load: libs/libfbink_input.so.1
[FBInk] /dev/input/event0: `gpio-keys` = KEY | POWER_BUTTON | SLEEP_COVER | PAGINATION_BUTTONS | ROTATION_EVENT
[FBInk] /dev/input/event1: `Elan Touchscreen` = TOUCHSCREEN | TABLET | KEY | SCALED_TABLET
[FBInk] /dev/input/event2: `kx122-accel` = ACCELEROMETER
[FBInk] /dev/input/event3: `P15USB30216C` = UNKNOWN
[ko-input] Forked off fake event generator (pid: 2545)
03/26/26-12:22:48 INFO  initializing for device Kobo_io 
03/26/26-12:22:48 INFO  framebuffer resolution: {
  h = 1680,
  w = 1264
} --[[table: 0x7673fdc0]] 
ffi.findlib: wrap-mupdf
ffi.load: libs/libwrap-mupdf.so
ffi.findlib: sqlite3 [0]
ffi.load: libs/libsqlite3.so.0
03/26/26-12:22:49 INFO  Applying patch: ./patches/2---stretched-covers.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/2--disable-all-CB-widgets.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/2--disable-all-PT-widgets.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/2--rounded-covers.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/2--stretched-rounded-covers.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/2-new-collections-star.lua 
ffi.findlib: freetype [6]
ffi.load: libs/libfreetype.so.6
ffi.findlib: harfbuzz [0]
ffi.load: libs/libharfbuzz.so.0
ffi.findlib: zstd [1]
ffi.load: libs/libzstd.so.1
03/26/26-12:22:49 INFO  Applying patch: ./patches/2-new-progress-bar.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/2-new-status-icons.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/2-pages-badge-sdr.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/2-percent-badge.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/2-rounded-folder-covers.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/2-series-badge-numbered.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/2-series-indicator.lua 
03/26/26-12:22:49 INFO  Applying patch: ./patches/20-faded-finished-books.lua 
ffi.findlib: crypto [57]
ffi.load: libs/libcrypto.so.57
ffi.findlib: leptonica [6]
ffi.load: libs/libleptonica.so.6
ffi.findlib: k2pdfopt [2]
ffi.load: libs/libk2pdfopt.so.2
03/26/26-12:22:51 INFO  opening file /mnt/onboard/.adds/Livres/Wayward Pines - L'Integrale - Blake Crouch & Patrick Imbert (47).epub 
03/26/26-12:22:52 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/EB_Garamond/static/EBGaramond-Italic.ttf> 
03/26/26-12:22:52 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/EB_Garamond/static/EBGaramond-Regular.ttf> 
03/26/26-12:22:52 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Literata/static/Literata-Italic.ttf> 
03/26/26-12:22:52 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Literata/static/Literata-Regular.ttf> 
03/26/26-12:22:52 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Microsoft Aptos Fonts/Aptos-Display-Bold-Italic.ttf> 
03/26/26-12:22:52 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Microsoft Aptos Fonts/Aptos-Display-Bold.ttf> 
03/26/26-12:22:52 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Microsoft Aptos Fonts/Aptos-Italic.ttf> 
03/26/26-12:22:53 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Microsoft Aptos Fonts/Aptos.ttf> 
03/26/26-12:22:53 INFO  Inhibiting user input 
03/26/26-12:22:53 INFO  Looking for plugins in directory: plugins 
03/26/26-12:22:54 WARN  Audiobook: failed to load plugins/audiobook.koplugin/bugreport.lua : plugins/audiobook.koplugin/bugreport.lua:98: function arguments expected near 'and' 
03/26/26-12:22:54 INFO  Aspect ratio control applied successfully 
03/26/26-12:22:54 INFO  Loading aspect ratio control (0.67) with SVG rounded corners 
03/26/26-12:22:54 INFO  Aspect ratio control applied successfully 
03/26/26-12:22:56 INFO  Restoring user input handling 
03/26/26-12:25:29 INFO  Terminal: spawning shell /bin/sh 
03/26/26-12:25:29 INFO  Terminal: spawn done 
03/26/26-12:26:58 WARN  Audiobook: Found word ' soir ' via screen-pos at 967 (approx_offset= 970 screen_y= 956 dist= 3 ) 
03/26/26-12:26:58 WARN  SyncController: start() — screen 1264 x 1680 mode= portrait rotation= 0 
03/26/26-12:26:58 WARN  SyncController: readNextSentence idx= 1 / 8 state= loading 
03/26/26-12:26:58 WARN  SyncController: Queueing sentence 1 via Piper prefetch queue ( Le soir venait de tomber, le ciel pur s\E2 ) 
03/26/26-12:26:58 WARN  PiperQueue: CPU cores: 1 → SERVER_COUNT: 1 BATCH_SIZE: 3 
03/26/26-12:26:59 WARN  PiperQueue: _resolvePiperModel – explicit path failed, falling back. piper_model= (nil) piper_model_dir= plugins/audiobook.koplugin/piper 
03/26/26-12:26:59 WARN  PiperQueue: Model sample rate = 22050 Hz 
03/26/26-12:26:59 WARN  PiperQueue: Server 1 launching... 
03/26/26-12:26:59 WARN  SyncController: espeak cold-start fallback for sentence 1 
03/26/26-12:26:59 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-12:27:00 WARN  SyncController: beginSentencePlayback sentence 1 has_audio= true 
03/26/26-12:27:00 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774524419_9.wav is_speaking= false 
03/26/26-12:27:00 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-12:27:00 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-12:27:00 WARN  TTSEngine: io.popen launch took 0 ms, PID= 2714 
03/26/26-12:27:00 WARN  PiperQueue: Server 1 ready, PID: 2702 piper_pid: 2703 
03/26/26-12:27:00 WARN  PiperQueue: All 1 servers ready in 1761 ms 
03/26/26-12:27:00 WARN  PiperQueue: BATCH → server 1 : 3 sentences ( Le soir venait de tomber, le ciel pur s’assombrissait et l ) 
03/26/26-12:27:00 WARN  SyncController: Highlighting sentence 1 (scheduled+1761ms) 
03/26/26-12:27:00 WARN  TTSEngine: Process watcher → normal completion, elapsed= 1899 ms 
03/26/26-12:27:00 WARN  TTSEngine: onPlaybackComplete gen= 1 pid= 2714 
03/26/26-12:27:00 WARN  SyncController: Completion callback, concat ending at sentence 1 state= playing 
03/26/26-12:27:00 WARN  SyncController: Piper gap padded in audio ( sentence ), delay=0.05s 
03/26/26-12:27:00 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 1 state= playing 
03/26/26-12:27:00 WARN  SyncController: readNextSentence idx= 2 / 8 state= playing 
03/26/26-12:27:00 WARN  SyncController: espeak cold-start fallback for sentence 2 (early, Piper status: pending ) 
03/26/26-12:27:00 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-12:27:00 WARN  SyncController: beginSentencePlayback sentence 2 has_audio= true 
03/26/26-12:27:00 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774524420_10.wav is_speaking= false 
03/26/26-12:27:00 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-12:27:00 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-12:27:00 WARN  TTSEngine: io.popen launch took 0 ms, PID= 2718 
03/26/26-12:27:00 WARN  SyncController: Highlighting sentence 2 (scheduled+249ms) 
03/26/26-12:27:01 WARN  TTSEngine: Process watcher → normal completion, elapsed= 810 ms 
03/26/26-12:27:01 WARN  TTSEngine: onPlaybackComplete gen= 3 pid= 2718 
03/26/26-12:27:01 WARN  SyncController: Completion callback, concat ending at sentence 2 state= playing 
03/26/26-12:27:01 WARN  SyncController: Piper gap padded in audio ( paragraph ), delay=0.05s 
03/26/26-12:27:01 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 2 state= playing 
03/26/26-12:27:01 WARN  SyncController: readNextSentence idx= 3 / 8 state= playing 
03/26/26-12:27:01 WARN  SyncController: espeak cold-start fallback for sentence 3 (early, Piper status: pending ) 
03/26/26-12:27:01 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-12:27:01 WARN  SyncController: beginSentencePlayback sentence 3 has_audio= true 
03/26/26-12:27:01 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774524421_11.wav is_speaking= false 
03/26/26-12:27:01 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-12:27:01 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-12:27:01 WARN  TTSEngine: io.popen launch took 0 ms, PID= 2726 
03/26/26-12:27:01 WARN  SyncController: Highlighting sentence 3 (scheduled+157ms) 
03/26/26-12:27:02 WARN  TTSEngine: Process watcher → normal completion, elapsed= 946 ms 
03/26/26-12:27:02 WARN  TTSEngine: onPlaybackComplete gen= 5 pid= 2726 
03/26/26-12:27:02 WARN  SyncController: Completion callback, concat ending at sentence 3 state= playing 
03/26/26-12:27:02 WARN  SyncController: Piper gap padded in audio ( sentence ), delay=0.05s 
03/26/26-12:27:02 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 3 state= playing 
03/26/26-12:27:02 WARN  SyncController: readNextSentence idx= 4 / 8 state= playing 
03/26/26-12:27:02 WARN  SyncController: espeak cold-start fallback for sentence 4 (early, Piper status: queued ) 
03/26/26-12:27:02 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-12:27:02 WARN  SyncController: beginSentencePlayback sentence 4 has_audio= true 
03/26/26-12:27:02 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774524422_12.wav is_speaking= false 
03/26/26-12:27:02 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-12:27:02 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-12:27:02 WARN  TTSEngine: io.popen launch took 0 ms, PID= 2736 
03/26/26-12:27:02 WARN  SyncController: Highlighting sentence 4 (scheduled+211ms) 
03/26/26-12:27:03 WARN  TTSEngine: Process watcher → normal completion, elapsed= 888 ms 
03/26/26-12:27:03 WARN  TTSEngine: onPlaybackComplete gen= 7 pid= 2736 
03/26/26-12:27:03 WARN  SyncController: Completion callback, concat ending at sentence 4 state= playing 
03/26/26-12:27:03 WARN  SyncController: Piper gap padded in audio ( paragraph ), delay=0.05s 
03/26/26-12:27:03 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 4 state= playing 
03/26/26-12:27:03 WARN  SyncController: readNextSentence idx= 5 / 8 state= playing 
03/26/26-12:27:03 WARN  SyncController: espeak cold-start fallback for sentence 5 (early, Piper status: queued ) 
03/26/26-12:27:03 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-12:27:03 WARN  SyncController: beginSentencePlayback sentence 5 has_audio= true 
03/26/26-12:27:03 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774524423_13.wav is_speaking= false 
03/26/26-12:27:03 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-12:27:03 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-12:27:03 WARN  TTSEngine: io.popen launch took 0 ms, PID= 2745 
03/26/26-12:27:03 WARN  SyncController: Highlighting sentence 5 (scheduled+166ms) 
03/26/26-12:27:04 WARN  TTSEngine: Process watcher → normal completion, elapsed= 840 ms 
03/26/26-12:27:04 WARN  TTSEngine: onPlaybackComplete gen= 9 pid= 2745 
03/26/26-12:27:04 WARN  SyncController: Completion callback, concat ending at sentence 5 state= playing 
03/26/26-12:27:04 WARN  SyncController: Piper gap padded in audio ( paragraph ), delay=0.05s 
03/26/26-12:27:04 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 5 state= playing 
03/26/26-12:27:04 WARN  SyncController: readNextSentence idx= 6 / 8 state= playing 
03/26/26-12:27:04 WARN  SyncController: espeak cold-start fallback for sentence 6 (early, Piper status: queued ) 
03/26/26-12:27:04 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-12:27:04 WARN  SyncController: beginSentencePlayback sentence 6 has_audio= true 
03/26/26-12:27:04 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774524424_14.wav is_speaking= false 
03/26/26-12:27:04 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-12:27:04 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-12:27:04 WARN  TTSEngine: io.popen launch took 0 ms, PID= 2754 
03/26/26-12:27:04 WARN  SyncController: Highlighting sentence 6 (scheduled+151ms) 
03/26/26-12:27:05 WARN  TTSEngine: Process watcher → normal completion, elapsed= 940 ms 
03/26/26-12:27:05 WARN  TTSEngine: onPlaybackComplete gen= 11 pid= 2754 
03/26/26-12:27:05 WARN  SyncController: Completion callback, concat ending at sentence 6 state= playing 
03/26/26-12:27:05 WARN  SyncController: Piper gap padded in audio ( paragraph ), delay=0.05s 
03/26/26-12:27:05 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 6 state= playing 
03/26/26-12:27:05 WARN  SyncController: readNextSentence idx= 7 / 8 state= playing 
03/26/26-12:27:05 WARN  SyncController: espeak cold-start fallback for sentence 7 (early, Piper status: queued ) 
03/26/26-12:27:05 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-12:27:05 WARN  SyncController: beginSentencePlayback sentence 7 has_audio= true 
03/26/26-12:27:05 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774524425_15.wav is_speaking= false 
03/26/26-12:27:05 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-12:27:05 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-12:27:05 WARN  TTSEngine: io.popen launch took 0 ms, PID= 2764 
03/26/26-12:27:05 WARN  SyncController: Highlighting sentence 7 (scheduled+182ms) 
03/26/26-12:27:06 WARN  SyncController: stop() from state= playing sentence= 7 / 8 caller: 
stack traceback:
	plugins/audiobook.koplugin/synccontroller.lua:1016: in function 'on_close'
	plugins/audiobook.koplugin/playbackbar.lua:266: in function 'onClose'
	plugins/audiobook.koplugin/playbackbar.lua:135: in function 'callback'
	frontend/ui/widget/button.lua:493: in function 'handleEvent'
	frontend/ui/widget/container/inputcontainer.lua:269: in function 'handleEvent'
	frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
	frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
	frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
	frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
	frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
	...
	frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
	frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
	frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
	frontend/ui/uimanager.lua:896: in function 'sendEvent'
	frontend/ui/uimanager.lua:53: in function '__default__'
	frontend/ui/uimanager.lua:1437: in function 'handleInputEvent'
	frontend/ui/uimanager.lua:1537: in function 'handleInput'
	frontend/ui/uimanager.lua:1581: in function 'run'
	./reader.lua:286: in main chunk
	[C]: at 0x00013ea1 
03/26/26-12:27:06 WARN  SyncController: Stopped 
03/26/26-12:27:28 WARN  Audiobook: onCloseDocument event received 
03/26/26-12:27:28 WARN  Audiobook: stopReadAlong() called 
03/26/26-12:27:28 WARN  SyncController: Stopped 
03/26/26-12:27:28 WARN  PiperQueue: Servers stopped, rescued 0 pending entries 
03/26/26-12:27:28 WARN  Audiobook: onCloseWidget event received 
03/26/26-12:27:28 WARN  Audiobook: stopReadAlong() called 
03/26/26-12:27:28 WARN  SyncController: Stopped 
03/26/26-12:27:28 WARN  PiperQueue: Servers stopped, rescued 0 pending entries 
03/26/26-12:27:28 INFO  UIManager: No dialogs left to show 
03/26/26-12:27:28 INFO  Tearing down UIManager with exit code: 0 
[ko-input] Closed input device with fd: 7 @ idx: 2 (matched by idx)
[ko-input] Closed input device with fd: 6 @ idx: 1 (matched by idx)
[ko-input] Closed input device with fd: 5 @ idx: 0 (matched by idx)
Restoring original fb bitdepth @ 32bpp & rotation @ 1
[FBInk] Detected a Kobo Libra 2 (388 => Io @ Mark 9)
[FBInk] Enabled Kobo Mark 7 quirks
[FBInk] Clock tick frequency appears to be 100 Hz
[FBInk] Screen density set to 300 dpi
[FBInk] Variable fb info: 1264x1680, 8bpp @ rotation: 1 (Clockwise, 90°)
[FBInk] Fixed fb info: ID is "mxc_epdc_fb", length of fb mem: 9175040 bytes & line length: 1280 bytes
[FBInk] Canonical rotation: 0 (Upright, 0°)
[FBInk] Fontsize set to 32x32 (IBM (Default) base glyph size: 8x8)
[FBInk] Line length: 39 cols, Page size: 52 rows
[FBInk] Vertical fit isn't perfect, shifting rows down by 8 pixels
[FBInk] Framebuffer pixel format: Y8
[FBDepth] Screen is 1264x1680 (1280x7168 addressable, fb says 1280x3584)
[FBDepth] Buffer is mapped for 9175040 bytes with a scanline stride of 1280 bytes
[FBDepth] Current rotation is already 1!
[FBDepth] Switching fb to 32bpp @ rotation 1 . . .
Updating bitdepth from 8bpp to 32bpp
Sanitizing grayscale flag for bitdepths > 8bpp
Updating rotation from 1 (Clockwise, 90°) to 1 (Clockwise, 90°)
Bitdepth is now 32bpp (grayscale: 0) @ rotate: 1 (Clockwise, 90°)
[FBInk] Detected a change in framebuffer bitdepth (8 -> 32)
[FBInk] Reinitializing...
[FBInk] Variable fb info: 1264x1680, 32bpp @ rotation: 1 (Clockwise, 90°)
[FBInk] Fixed fb info: ID is "mxc_epdc_fb", length of fb mem: 9175040 bytes & line length: 5120 bytes
[FBInk] Canonical rotation: 0 (Upright, 0°)
[FBInk] Fontsize set to 32x32 (IBM (Default) base glyph size: 8x8)
[FBInk] Line length: 39 cols, Page size: 52 rows
[FBInk] Vertical fit isn't perfect, shifting rows down by 8 pixels
[FBInk] Framebuffer pixel format: BGRA
[FBDepth] Screen is 1264x1680 (1280x1792 addressable, fb says 1280x1792)
[FBDepth] Buffer is mapped for 9175040 bytes with a scanline stride of 5120 bytes
Original fb rotation is set @ 1
Original fb bitdepth is set @ 32bpp
Switching fb bitdepth to 8bpp & rotation to Portrait
[FBInk] Detected a Kobo Libra 2 (388 => Io @ Mark 9)
[FBInk] Enabled Kobo Mark 7 quirks
[FBInk] Clock tick frequency appears to be 100 Hz
[FBInk] Screen density set to 300 dpi
[FBInk] Variable fb info: 1264x1680, 32bpp @ rotation: 1 (Clockwise, 90°)
[FBInk] Fixed fb info: ID is "mxc_epdc_fb", length of fb mem: 9175040 bytes & line length: 5120 bytes
[FBInk] Canonical rotation: 0 (Upright, 0°)
[FBInk] Fontsize set to 32x32 (IBM (Default) base glyph size: 8x8)
[FBInk] Line length: 39 cols, Page size: 52 rows
[FBInk] Vertical fit isn't perfect, shifting rows down by 8 pixels
[FBInk] Framebuffer pixel format: BGRA
[FBDepth] Screen is 1264x1680 (1280x1792 addressable, fb says 1280x1792)
[FBDepth] Buffer is mapped for 9175040 bytes with a scanline stride of 5120 bytes
[FBDepth] Requested canonical rota 0 translates to 1 for this device
[FBDepth] Current rotation is already 1!
[FBDepth] Switching fb to 8bpp @ rotation 1 . . .
Updating bitdepth from 32bpp to 8bpp
Sanitizing grayscale flag for 8bpp
Updating rotation from 1 (Clockwise, 90°) to 1 (Clockwise, 90°)
Bitdepth is now 8bpp (grayscale: 1) @ rotate: 1 (Clockwise, 90°)
[FBInk] Detected a change in framebuffer bitdepth (32 -> 8)
[FBInk] Reinitializing...
[FBInk] Variable fb info: 1264x1680, 8bpp @ rotation: 1 (Clockwise, 90°)
[FBInk] Fixed fb info: ID is "mxc_epdc_fb", length of fb mem: 9175040 bytes & line length: 1280 bytes
[FBInk] Canonical rotation: 0 (Upright, 0°)
[FBInk] Fontsize set to 32x32 (IBM (Default) base glyph size: 8x8)
[FBInk] Line length: 39 cols, Page size: 52 rows
[FBInk] Vertical fit isn't perfect, shifting rows down by 8 pixels
[FBInk] Framebuffer pixel format: Y8
[FBDepth] Screen is 1264x1680 (1280x7168 addressable, fb says 1280x3584)
[FBDepth] Buffer is mapped for 9175040 bytes with a scanline stride of 1280 bytes
---------------------------------------------

[stradichenko]

In v0.1.5.8 more information regarding the BT has been added to the report generator.
Also after trying this version; could you give me more information on the BT aspect? All the menu's seem correct? The text-highlighting is working? there's not sound coming out with any model, Espeaker and Piper? In Kobo at least, once connected it should be able to pause/unpause.

[tartanpion]

Menu ok. No sound. For now just failed to power on bluetooth. piper or espeak.
When i try to use it from a word, it seems to pause after 3 or 4 paragraphs (text highlighted). pause play ok when manually.

=== Audiobook Read-Along Bug Report (v0.1.5.8) ===
Generated: 2026-03-26T16:41:49Z
Method: generate-report.sh (standalone)

── Device ──
  platform: kobo
  model: io
io
  arch: armv7l
  uname: Linux kobo 4.1.15-00868-g58a2758be07 #106 SMP PREEMPT Thu Aug 7 08:28:07 Asia 2025 armv7l GNU/Linux

── KOReader ──
  koreader_version: v2026.03-22-g530ee8ab9_2026-03-25

── Plugin ──
  plugin_version: 0.1.5.8
  plugin_dir: /mnt/onboard/.adds/koreader/plugins/audiobook.koplugin
  has_bundled_espeak: yes
  has_bundled_piper: yes
  piper_models: en_US-danny-low.onnx,fr_FR-upmc-medium.onnx

── Plugin Settings ──
  (not available -- requires KOReader runtime)

── Audio & TTS ──
  tts_in_path:
    (none found)  players_in_path:
    aplay: /bin/aplay
    gst-launch-1.0: /bin/gst-launch-1.0  alsa_cards: --- no soundcards ---
  bt_available: yes
  bt_hci_devices: hci0
  bt_paired_devices: none
  bt_connected_devices: none
  bt_hcitool_con: Connections:
  bt_daemon: not running
  gst_bt_sink: not found
  gst_audio_sinks: alsa:  alsasrc: Audio source (ALSA)
alsa:  alsasink: Audio sink (ALSA)
mpg123:  mpg123audiodec: mpg123 mp3 decoder
audioresample:  audioresample: Audio resampler
app:  appsink: AppSink
audioconvert:  audioconvert: Audio converter
autodetect:  autovideosink: Auto video sink
autodetect:  autoaudiosink: Auto audio sink
autodetect:  autoaudiosrc: Auto audio source
audiomixer:  audiomixer: AudioMixer
audiomixer:  liveadder: AudioMixer
audiomixer:  audiointerleave: AudioInterleave
audiorate:  audiorate: Audio rate adjuster
typefindfunctions: audio/x-musepack: mpc, mpp, mp+
typefindfunctions: audio/x-au: au, snd
typefindfunctions: audio/qcelp: qcp
typefindfunctions: audio/x-imelody: imy, ime, imelody
typefindfunctions: audio/midi: mid, midi
typefindfunctions: audio/riff-midi: mid, midi
typefindfunctions: audio/mobile-xmf: mxmf
typefindfunctions: audio/x-ttafile: tta
typefindfunctions: audio/x-mod: 669, amf, ams, dbm, digi, dmf, dsm, gdm, far, imf, it, j2b, mdl, med, mod, mt2, mtm, okt, psm, ptm, sam, s3m, stm, stx, ult, umx, xm
typefindfunctions: audio/mpeg: mp3, mp2, mp1, mpga
typefindfunctions: audio/x-ac3: ac3, eac3
typefindfunctions: audio/x-dts: dts
typefindfunctions: audio/x-gsm: gsm
typefindfunctions: audio/x-m4a: m4a
typefindfunctions: application/x-pn-realaudio: ra, ram, rm, rmvb
typefindfunctions: audio/x-wav: wav
typefindfunctions: audio/x-aiff: aiff, aif, aifc
typefindfunctions: audio/x-svx: iff, svx
typefindfunctions: audio/x-paris: paf
typefindfunctions: audio/x-nist: nist
typefindfunctions: audio/x-voc: voc
typefindfunctions: audio/x-sds: sds
typefindfunctions: audio/x-ircam: sf
typefindfunctions: audio/x-w64: w64
typefindfunctions: audio/x-rf64: rf64
typefindfunctions: audio/x-shorten: shn
typefindfunctions: audio/x-amr-nb-sh: amr
typefindfunctions: audio/x-amr-wb-sh: amr
typefindfunctions: audio/iLBC-sh: ilbc
typefindfunctions: audio/x-sbc: sbc
typefindfunctions: audio/x-sid: sid
typefindfunctions: audio/x-flac: flac
typefindfunctions: audio/x-vorbis: no extensions
typefindfunctions: application/x-ogm-audio: no extensions
typefindfunctions: audio/x-speex: no extensions
typefindfunctions: audio/x-celt: no extensions
typefindfunctions: audio/aac: aac, adts, adif, loas
typefindfunctions: audio/x-spc: spc
typefindfunctions: audio/x-wavpack: wv, wvp
typefindfunctions: audio/x-wavpack-correction: wvc
typefindfunctions: audio/x-caf: caf
typefindfunctions: audio/x-nsf: nsf
typefindfunctions: audio/x-gym: gym
typefindfunctions: audio/x-ay: ay
typefindfunctions: audio/x-gbs: gbs
typefindfunctions: audio/x-vgm: vgm
typefindfunctions: audio/x-sap: sap
typefindfunctions: audio/x-kss: kss
typefindfunctions: audio/x-xi: xi
typefindfunctions: audio/audible: aa, aax
gio:  giosink: GIO sink
gio:  giostreamsink: GIO stream sink
rawparse:  unalignedaudioparse: unalignedaudioparse
rawparse:  rawaudioparse: rawaudioparse
coreelements:  fakesink: Fake Sink
coreelements:  fdsink: Filedescriptor Sink
coreelements:  filesink: File Sink
audiotestsrc:  audiotestsrc: Audio test source
audioparsers:  aacparse: AAC audio stream parser
audioparsers:  amrparse: AMR audio stream parser
audioparsers:  ac3parse: AC3 audio stream parser
audioparsers:  dcaparse: DTS Coherent Acoustics audio stream parser
audioparsers:  flacparse: FLAC audio parser
audioparsers:  mpegaudioparse: MPEG1 Audio Parser
audioparsers:  sbcparse: SBC audio parser
audioparsers:  wavpackparse: Wavpack audio stream parser
wavparse:  wavparse: WAV audio demuxer
tcp:  tcpclientsink: TCP client sink
tcp:  tcpserversink: TCP server sink
tcp:  multifdsink: Multi filedescriptor sink
tcp:  multisocketsink: Multi socket sink
audiofx:  audiopanorama: Stereo positioning
audiofx:  audioinvert: Audio inversion
audiofx:  audiokaraoke: AudioKaraoke
audiofx:  audioamplify: Audio amplifier
audiofx:  audiodynamic: Dynamic range controller
audiofx:  audiocheblimit: Low pass & high pass filter
audiofx:  audiochebband: Band pass & band reject filter
audiofx:  audioiirfilter: Audio IIR filter
audiofx:  audiowsinclimit: Low pass & high pass filter
audiofx:  audiowsincband: Band pass & band reject filter
audiofx:  audiofirfilter: Audio FIR filter
audiofx:  audioecho: Audio echo
audiofx:  scaletempo: Scaletempo
playback:  playsink: Player Sink
wavenc:  wavenc: WAV audio muxer
  bt_abstract_socket: 
  tmp_writable: yes

── Resources ──
  meminfo:
    MemTotal:         507600 kB
    MemFree:          320436 kB
    MemAvailable:     390044 kB
    Buffers:            8928 kB
    Cached:            80220 kB
  disk_tmp: none                    247.9M    120.0K    247.7M   0% /tmp

=== End of Bug Report ===

                launching...
  _  _____  ____                _
 | |/ / _ \|  _ \ ___  __ _  __| | ___ _ __
 | ' / | | | |_) / _ \/ _` |/ _` |/ _ \ '__|
 | . \ |_| |  _ <  __/ (_| | (_| |  __/ |
 |_|\_\___/|_| \_\___|\__,_|\__,_|\___|_|

 It's a scroll... It's a codex... It's KOReader!

 [*] Current time: 03/26/26-17:40:25
has monolibtic? no (libs/libkoreader-monolibtic.so: cannot open shared object file: No such file or directory)
lib_search_path: libs/?
lib_basic_format: lib%s.so
lib_version_format: lib%s.so.%s
 [*] Version: v2026.03-22-g530ee8ab9_2026-03-25

ffi.load: rt.so.1 (RTLD_GLOBAL)
ffi.findlib: utf8proc [3]
ffi.load: libs/libutf8proc.so.3
ffi.findlib: blitbuffer
ffi.load: libs/libblitbuffer.so
ffi.findlib: archive [13]
ffi.load: libs/libarchive.so.13
ffi.findlib: fbink_input [1]
ffi.load: libs/libfbink_input.so.1
[FBInk] /dev/input/event0: `gpio-keys` = KEY | POWER_BUTTON | SLEEP_COVER | PAGINATION_BUTTONS | ROTATION_EVENT
[FBInk] /dev/input/event1: `Elan Touchscreen` = TOUCHSCREEN | TABLET | KEY | SCALED_TABLET
[FBInk] /dev/input/event2: `kx122-accel` = ACCELEROMETER
[FBInk] /dev/input/event3: `P15USB30216C` = UNKNOWN
[ko-input] Forked off fake event generator (pid: 3048)
03/26/26-17:40:26 INFO  initializing for device Kobo_io 
03/26/26-17:40:26 INFO  framebuffer resolution: {
  h = 1680,
  w = 1264
} --[[table: 0x768e7470]] 
ffi.findlib: wrap-mupdf
ffi.load: libs/libwrap-mupdf.so
ffi.findlib: sqlite3 [0]
ffi.load: libs/libsqlite3.so.0
03/26/26-17:40:26 INFO  Applying patch: ./patches/2---stretched-covers.lua 
03/26/26-17:40:26 INFO  Applying patch: ./patches/2--disable-all-CB-widgets.lua 
03/26/26-17:40:26 INFO  Applying patch: ./patches/2--disable-all-PT-widgets.lua 
03/26/26-17:40:26 INFO  Applying patch: ./patches/2--rounded-covers.lua 
03/26/26-17:40:26 INFO  Applying patch: ./patches/2--stretched-rounded-covers.lua 
03/26/26-17:40:26 INFO  Applying patch: ./patches/2-navbar-vos.lua 
ffi.findlib: freetype [6]
ffi.load: libs/libfreetype.so.6
ffi.findlib: harfbuzz [0]
ffi.load: libs/libharfbuzz.so.0
ffi.findlib: zstd [1]
ffi.load: libs/libzstd.so.1
ffi.findlib: leptonica [6]
ffi.load: libs/libleptonica.so.6
ffi.findlib: k2pdfopt [2]
ffi.load: libs/libk2pdfopt.so.2
ffi.findlib: crypto [57]
ffi.load: libs/libcrypto.so.57
03/26/26-17:40:28 INFO  Applying patch: ./patches/2-new-collections-star.lua 
03/26/26-17:40:28 INFO  Applying patch: ./patches/2-new-progress-bar-colored.lua 
03/26/26-17:40:28 INFO  Applying patch: ./patches/2-new-progress-bar.lua 
03/26/26-17:40:28 INFO  Applying patch: ./patches/2-new-status-icons.lua 
03/26/26-17:40:28 INFO  Applying patch: ./patches/2-pages-badge-sdr.lua 
03/26/26-17:40:28 INFO  Applying patch: ./patches/2-pages-badge.lua 
03/26/26-17:40:28 INFO  Applying patch: ./patches/2-percent-badge.lua 
03/26/26-17:40:28 INFO  Applying patch: ./patches/2-rounded-folder-covers.lua 
03/26/26-17:40:28 INFO  Applying patch: ./patches/2-series-badge-numbered.lua 
03/26/26-17:40:28 INFO  Applying patch: ./patches/2-series-indicator.lua 
03/26/26-17:40:28 INFO  Applying patch: ./patches/20-faded-finished-books.lua 
03/26/26-17:40:28 INFO  opening file /mnt/onboard/.adds/Livres/Wayward Pines - L'Integrale - Blake Crouch & Patrick Imbert (47).epub 
03/26/26-17:40:29 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/EB_Garamond/static/EBGaramond-Italic.ttf> 
03/26/26-17:40:29 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/EB_Garamond/static/EBGaramond-Regular.ttf> 
03/26/26-17:40:29 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Literata/static/Literata-Italic.ttf> 
03/26/26-17:40:29 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Literata/static/Literata-Regular.ttf> 
03/26/26-17:40:30 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Microsoft Aptos Fonts/Aptos-Display-Bold-Italic.ttf> 
03/26/26-17:40:30 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Microsoft Aptos Fonts/Aptos-Display-Bold.ttf> 
03/26/26-17:40:30 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Microsoft Aptos Fonts/Aptos-Italic.ttf> 
03/26/26-17:40:30 ERROR failed to register crengine font: cannot register font <./fonts/polices personelles/Microsoft Aptos Fonts/Aptos.ttf> 
03/26/26-17:40:31 INFO  Inhibiting user input 
03/26/26-17:40:31 INFO  Looking for plugins in directory: plugins 
03/26/26-17:40:32 WARN  PiperQueue: Model sample rate = 22050 Hz 
03/26/26-17:40:32 INFO  Aspect ratio control applied successfully 
03/26/26-17:40:32 INFO  Loading aspect ratio control (0.67) with SVG rounded corners 
03/26/26-17:40:32 INFO  Aspect ratio control applied successfully 
03/26/26-17:40:34 INFO  Restoring user input handling 
03/26/26-17:40:36 INFO  WakeupMgr: scheduling wakeup in 26 -> 1774543262 
03/26/26-17:41:06 INFO  WakeupMgr: scheduling wakeup in 56 -> 1774543322 
03/26/26-17:41:22 INFO  WakeupMgr: scheduling wakeup in 39 -> 1774543321 
03/26/26-17:41:35 INFO  WakeupMgr: scheduling wakeup in 25 -> 1774543320 
03/26/26-17:41:40 INFO  Terminal: spawning shell /bin/sh 
03/26/26-17:41:40 INFO  Terminal: spawn done 
03/26/26-17:41:53 INFO  WakeupMgr: scheduling wakeup in 1 -> 1774543314 
03/26/26-17:42:03 INFO  WakeupMgr: scheduling wakeup in 1 -> 1774543324 
03/26/26-17:42:08 INFO  WakeupMgr: scheduling wakeup in 1 -> 1774543329 
03/26/26-17:42:19 INFO  WakeupMgr: scheduling wakeup in 3 -> 1774543342 
03/26/26-17:42:26 INFO  WakeupMgr: scheduling wakeup in 4 -> 1774543350 
03/26/26-17:42:33 INFO  WakeupMgr: scheduling wakeup in 1 -> 1774543354 
03/26/26-17:42:52 INFO  WakeupMgr: scheduling wakeup in 5 -> 1774543377 
Cannot write `standby` to file `/sys/power/state`:	Device or resource busy
03/26/26-17:42:53 WARN  Kobo standby: the kernel refused to enter standby! 
03/26/26-17:43:01 WARN  Audiobook: Found word ' Le ' via screen-pos at 476 (approx_offset= 477 screen_y= 638 dist= 1 ) 
03/26/26-17:43:02 WARN  SyncController: start() — screen 1264 x 1680 mode= portrait rotation= 0 
03/26/26-17:43:02 WARN  SyncController: readNextSentence idx= 1 / 13 state= loading 
03/26/26-17:43:02 WARN  SyncController: Queueing sentence 1 via Piper prefetch queue ( Le seul bruit provenait des tubes néon  ) 
03/26/26-17:43:02 WARN  PiperQueue: CPU cores: 1 → SERVER_COUNT: 1 BATCH_SIZE: 3 
03/26/26-17:43:02 WARN  PiperQueue: Server 1 launching... 
03/26/26-17:43:02 WARN  SyncController: espeak cold-start fallback for sentence 1 
03/26/26-17:43:02 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-17:43:03 WARN  SyncController: beginSentencePlayback sentence 1 has_audio= true 
03/26/26-17:43:03 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774543382_14.wav is_speaking= false 
03/26/26-17:43:03 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-17:43:03 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-17:43:03 WARN  TTSEngine: io.popen launch took 0 ms, PID= 3229 
03/26/26-17:43:03 WARN  PiperQueue: Server 1 ready, PID: 3217 piper_pid: 3218 
03/26/26-17:43:03 WARN  PiperQueue: All 1 servers ready in 1647 ms 
03/26/26-17:43:03 WARN  PiperQueue: BATCH → server 1 : 3 sentences ( Le seul bruit provenait des tubes néon – une vibration do ) 
03/26/26-17:43:03 WARN  SyncController: Highlighting sentence 1 (scheduled+1647ms) 
03/26/26-17:43:03 WARN  TTSEngine: Process watcher → normal completion, elapsed= 1747 ms 
03/26/26-17:43:03 WARN  TTSEngine: onPlaybackComplete gen= 1 pid= 3229 
03/26/26-17:43:03 WARN  SyncController: Completion callback, concat ending at sentence 1 state= playing 
03/26/26-17:43:03 WARN  SyncController: Piper gap padded in audio ( paragraph ), delay=0.05s 
03/26/26-17:43:03 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 1 state= playing 
03/26/26-17:43:03 WARN  SyncController: readNextSentence idx= 2 / 13 state= playing 
03/26/26-17:43:03 WARN  SyncController: espeak cold-start fallback for sentence 2 (early, Piper status: pending ) 
03/26/26-17:43:03 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-17:43:03 WARN  SyncController: beginSentencePlayback sentence 2 has_audio= true 
03/26/26-17:43:03 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774543383_15.wav is_speaking= false 
03/26/26-17:43:03 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-17:43:03 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-17:43:03 WARN  TTSEngine: io.popen launch took 0 ms, PID= 3233 
03/26/26-17:43:03 WARN  SyncController: Highlighting sentence 2 (scheduled+218ms) 
03/26/26-17:43:04 WARN  TTSEngine: Process watcher → normal completion, elapsed= 786 ms 
03/26/26-17:43:04 WARN  TTSEngine: onPlaybackComplete gen= 3 pid= 3233 
03/26/26-17:43:04 WARN  SyncController: Completion callback, concat ending at sentence 2 state= playing 
03/26/26-17:43:04 WARN  SyncController: Piper gap padded in audio ( paragraph ), delay=0.05s 
03/26/26-17:43:04 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 2 state= playing 
03/26/26-17:43:04 WARN  SyncController: readNextSentence idx= 3 / 13 state= playing 
03/26/26-17:43:04 WARN  SyncController: espeak cold-start fallback for sentence 3 (early, Piper status: pending ) 
03/26/26-17:43:04 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-17:43:04 WARN  SyncController: beginSentencePlayback sentence 3 has_audio= true 
03/26/26-17:43:04 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774543384_16.wav is_speaking= false 
03/26/26-17:43:04 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-17:43:04 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-17:43:04 WARN  TTSEngine: io.popen launch took 0 ms, PID= 3241 
03/26/26-17:43:04 WARN  SyncController: Highlighting sentence 3 (scheduled+157ms) 
03/26/26-17:43:05 WARN  TTSEngine: Process watcher → normal completion, elapsed= 946 ms 
03/26/26-17:43:05 WARN  TTSEngine: onPlaybackComplete gen= 5 pid= 3241 
03/26/26-17:43:05 WARN  SyncController: Completion callback, concat ending at sentence 3 state= playing 
03/26/26-17:43:05 WARN  SyncController: Piper gap padded in audio ( paragraph ), delay=0.05s 
03/26/26-17:43:05 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 3 state= playing 
03/26/26-17:43:05 WARN  SyncController: readNextSentence idx= 4 / 13 state= playing 
03/26/26-17:43:05 WARN  SyncController: espeak cold-start fallback for sentence 4 (early, Piper status: queued ) 
03/26/26-17:43:05 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-17:43:05 WARN  SyncController: beginSentencePlayback sentence 4 has_audio= true 
03/26/26-17:43:05 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774543385_17.wav is_speaking= false 
03/26/26-17:43:05 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-17:43:05 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-17:43:05 WARN  TTSEngine: io.popen launch took 0 ms, PID= 3251 
03/26/26-17:43:05 INFO  WakeupMgr: scheduling wakeup in 1 -> 1774543386 
03/26/26-17:43:22 WARN  SyncController: Highlighting sentence 4 (scheduled+1075ms) 
03/26/26-17:43:25 WARN  TTSEngine: Process watcher → normal completion, elapsed= 4110 ms 
03/26/26-17:43:25 WARN  TTSEngine: onPlaybackComplete gen= 7 pid= 3251 
03/26/26-17:43:25 WARN  SyncController: Completion callback, concat ending at sentence 4 state= playing 
03/26/26-17:43:25 WARN  SyncController: Piper gap padded in audio ( sentence ), delay=0.05s 
03/26/26-17:43:25 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 4 state= playing 
03/26/26-17:43:25 WARN  SyncController: readNextSentence idx= 5 / 13 state= playing 
03/26/26-17:43:25 WARN  SyncController: espeak cold-start fallback for sentence 5 (early, Piper status: queued ) 
03/26/26-17:43:25 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-17:43:25 WARN  SyncController: beginSentencePlayback sentence 5 has_audio= true 
03/26/26-17:43:25 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774543405_18.wav is_speaking= false 
03/26/26-17:43:25 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-17:43:25 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-17:43:25 WARN  TTSEngine: io.popen launch took 0 ms, PID= 3258 
03/26/26-17:43:25 WARN  SyncController: Highlighting sentence 5 (scheduled+155ms) 
03/26/26-17:43:25 WARN  TTSEngine: Process watcher → normal completion, elapsed= 255 ms 
03/26/26-17:43:25 WARN  TTSEngine: onPlaybackComplete gen= 9 pid= 3258 
03/26/26-17:43:25 WARN  SyncController: Completion callback, concat ending at sentence 5 state= playing 
03/26/26-17:43:25 WARN  SyncController: Piper gap padded in audio ( paragraph ), delay=0.05s 
03/26/26-17:43:25 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 5 state= playing 
03/26/26-17:43:25 WARN  SyncController: readNextSentence idx= 6 / 13 state= playing 
03/26/26-17:43:25 WARN  SyncController: espeak cold-start fallback for sentence 6 (early, Piper status: queued ) 
03/26/26-17:43:25 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-17:43:25 WARN  SyncController: beginSentencePlayback sentence 6 has_audio= true 
03/26/26-17:43:25 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774543405_19.wav is_speaking= false 
03/26/26-17:43:25 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-17:43:25 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-17:43:25 WARN  TTSEngine: io.popen launch took 0 ms, PID= 3262 
03/26/26-17:43:25 WARN  SyncController: Highlighting sentence 6 (scheduled+249ms) 
03/26/26-17:43:26 WARN  TTSEngine: Process watcher → normal completion, elapsed= 826 ms 
03/26/26-17:43:26 WARN  TTSEngine: onPlaybackComplete gen= 11 pid= 3262 
03/26/26-17:43:26 WARN  SyncController: Completion callback, concat ending at sentence 6 state= playing 
03/26/26-17:43:26 WARN  SyncController: Piper gap padded in audio ( paragraph ), delay=0.05s 
03/26/26-17:43:26 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 6 state= playing 
03/26/26-17:43:26 WARN  SyncController: readNextSentence idx= 7 / 13 state= playing 
03/26/26-17:43:26 WARN  SyncController: espeak cold-start fallback for sentence 7 (early, Piper status: queued ) 
03/26/26-17:43:26 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-17:43:26 WARN  SyncController: beginSentencePlayback sentence 7 has_audio= true 
03/26/26-17:43:26 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774543406_20.wav is_speaking= false 
03/26/26-17:43:26 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-17:43:26 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-17:43:26 WARN  TTSEngine: io.popen launch took 0 ms, PID= 3270 
03/26/26-17:43:26 WARN  SyncController: Highlighting sentence 7 (scheduled+205ms) 
03/26/26-17:43:27 WARN  TTSEngine: Process watcher → normal completion, elapsed= 907 ms 
03/26/26-17:43:27 WARN  TTSEngine: onPlaybackComplete gen= 13 pid= 3270 
03/26/26-17:43:27 WARN  SyncController: Completion callback, concat ending at sentence 7 state= playing 
03/26/26-17:43:27 WARN  SyncController: Piper gap padded in audio ( paragraph ), delay=0.05s 
03/26/26-17:43:27 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 7 state= playing 
03/26/26-17:43:27 WARN  SyncController: readNextSentence idx= 8 / 13 state= playing 
03/26/26-17:43:27 WARN  SyncController: espeak cold-start fallback for sentence 8 (early, Piper status: queued ) 
03/26/26-17:43:27 WARN  TTSEngine: espeak fallback synthesis for cold-start 
03/26/26-17:43:27 WARN  SyncController: beginSentencePlayback sentence 8 has_audio= true 
03/26/26-17:43:27 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_espeak_fb_1774543407_21.wav is_speaking= false 
03/26/26-17:43:27 WARN  TTSEngine: play() findPlayer took 0 ms 
03/26/26-17:43:27 WARN  TTSEngine: play() pre-launch took 0 ms 
03/26/26-17:43:27 WARN  TTSEngine: io.popen launch took 0 ms, PID= 3279 
03/26/26-17:43:27 WARN  SyncController: Highlighting sentence 8 (scheduled+180ms) 
03/26/26-17:43:28 WARN  TTSEngine: Process watcher → normal completion, elapsed= 868 ms 
03/26/26-17:43:28 WARN  TTSEngine: onPlaybackComplete gen= 15 pid= 3279 
03/26/26-17:43:28 WARN  SyncController: Completion callback, concat ending at sentence 8 state= playing 
03/26/26-17:43:28 WARN  SyncController: Piper gap padded in audio ( paragraph ), delay=0.05s 
03/26/26-17:43:28 WARN  SyncController: Scheduling next sentence in 0.05 s from sentence= 8 state= playing 
03/26/26-17:43:28 WARN  SyncController: readNextSentence idx= 9 / 13 state= playing 
03/26/26-17:43:28 WARN  SyncController: Waiting for Piper prefetch (status: queued ) for sentence 9 | queued=10 pending=3 ready=0 failed=0 total=13 
03/26/26-17:43:28 INFO  WakeupMgr: scheduling wakeup in 1 -> 1774543409 
Cannot write `standby` to file `/sys/power/state`:	Operation not permitted
03/26/26-17:43:29 WARN  Kobo standby: the kernel refused to enter standby! 
03/26/26-17:43:32 WARN  SyncController: stop() from state= loading sentence= 9 / 13 caller: 
stack traceback:
	plugins/audiobook.koplugin/synccontroller.lua:1016: in function 'on_close'
	plugins/audiobook.koplugin/playbackbar.lua:266: in function 'onClose'
	plugins/audiobook.koplugin/playbackbar.lua:135: in function 'callback'
	frontend/ui/widget/button.lua:493: in function 'handleEvent'
	frontend/ui/widget/container/inputcontainer.lua:269: in function 'handleEvent'
	frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
	frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
	frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
	frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
	frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
	...
	frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
	frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
	frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
	frontend/ui/uimanager.lua:896: in function 'sendEvent'
	frontend/ui/uimanager.lua:53: in function '__default__'
	frontend/ui/uimanager.lua:1437: in function 'handleInputEvent'
	frontend/ui/uimanager.lua:1537: in function 'handleInput'
	frontend/ui/uimanager.lua:1581: in function 'run'
	./reader.lua:286: in main chunk
	[C]: at 0x00013ea1 
03/26/26-17:43:32 WARN  SyncController: Stopped 
03/26/26-17:43:36 INFO  WakeupMgr: scheduling wakeup in 26 -> 1774543442 
03/26/26-17:43:40 INFO  Exiting KOReader to enter USBMS mode... 
03/26/26-17:43:40 WARN  Audiobook: onCloseDocument event received 
03/26/26-17:43:40 WARN  Audiobook: stopReadAlong() called 
03/26/26-17:43:40 WARN  SyncController: Stopped 
03/26/26-17:43:40 WARN  PiperQueue: Servers stopped, rescued 0 pending entries 
03/26/26-17:43:41 WARN  Audiobook: onCloseWidget event received 
03/26/26-17:43:41 WARN  Audiobook: stopReadAlong() called 
03/26/26-17:43:41 WARN  SyncController: Stopped 
03/26/26-17:43:41 WARN  PiperQueue: Servers stopped, rescued 0 pending entries 
03/26/26-17:43:41 INFO  Preparing to quit UIManager with exit code: 86 
03/26/26-17:43:41 INFO  Tearing down UIManager with exit code: 86 
[ko-input] Closed input device with fd: 7 @ idx: 2 (matched by idx)
[ko-input] Closed input device with fd: 6 @ idx: 1 (matched by idx)
[ko-input] Closed input device with fd: 5 @ idx: 0 (matched by idx)

[stradichenko]

I have made some modifications (v0.1.5.9 on the way) but I do highly recommend you to use low Piper models on Kobos if possible; I have benchmarked medium voices so many times but the sentence synthesis always came out half-baked. After this bug phase passes; I'll try to add more efficient neural TTS models; so if you get it working on low; it will only improve from then on.

[tartanpion]

Still no Bluetooth. This time, when I run the plugin, it goes beyond just a few lines, but it crashes after about 1.5 pages, requiring a reboot. If necessary, I can enable more verbose logging in Kobo.Whether it's low or medium isn't the biggest issue. It's just that the best model was the medium one. I chose the only other 'Siwis low model' that was acceptable—not for the sound, but as a model.

audiobook-bug-report-20260326-183612.txt

crash.log

[stradichenko]

Yes, you can enable more verbose logging. This version (v.01.5.10) does a sanity check and goes to espeak-ng if determines that the PiperTTS is too much for the device. Try any low-voice which are more consistent, despite maybe sounding a bit worse than medium. If we get at least for espeak-ng to work on BT device, that'd be good enough and after solving cross-device issues, could start building other neural TTS that may be more efficient on all devices.

[tartanpion]

Verbose log. Just trying to enable bluetooth
crash.log

03/26/26-21:09:54 DEBUG BTManager: powering on

03/26/26-21:10:09 DEBUG BtMediaControl: No MediaTransport1 path found, cannot send status

Edit 1.5.10
with espeak this time. Still crash after a few lines.

crash.log

[stradichenko]

Could you generate a but report and the crash report to study them simultaneously? The bug report would inform me more on what is happening with the plugin.

[tartanpion]

No Bluetooth and the second crash report yesterday was with trying the plugin until crash
audiobook-bug-report-20260327-130649.txt
another one today with 2 crash first when trying bug report with the gui (until now that's was made in terminal) and the second crash after a few lines.
Here a few links describing some problem with Bluetooth and kobo
https://ogkevin.github.io/kobo.koplugin/dev/investigations/bluetooth/00-overview.html
OGKevin/kobo.koplugin#10
OGKevin/kobo.koplugin#70
koreader/koreader#12739

[stradichenko]

in version 0.1.5.12; this issue hopefully has been fixed.

[tartanpion]

Bluetooth on. But not pairing. and crash.
audiobook-bug-report-20260327-172413.txt

crash.log
and 03/27/26-14:18:16 WARN Audiobook: failed to load plugins/audiobook.koplugin/benchmarkrunner.lua : cannot open plugins/audiobook.koplugin/benchmarkrunner.lua: No such file or directory