Sway: output (display) rotation causes cursor to get stuck on remote

[ja-cop]

I'm connecting one system with KDE Plasma Wayland (right side) and one system with Sway (left side). The Sway system is on a laptop that can be folded into a tablet, so I have a keybinding to rotate Sway's output (in Sway, displays/screens are called "outputs").

To reproduce the issue I can do the following:

• I start lan-mouse on both systems, then move the mouse on the KDE system to the left edge, onto the Sway system
• Then I rotate Sway's output 90 degrees - lan-mouse still works as expected, I can move the cursor/focus back and forth
• Then I rotate the Sway output back to the original orientation - now the mouse/keyboard focus is locked on the Sway system. There's no messages in the lan-mouse log when I move the mouse to any edge of the display
• After restarting lan-mouse on the Sway system, it works again

Anyway, thanks for this awesome piece of software! I'm also looking forward to clipboard docs/support! I want to create a proper Guix package for this since the Sway system above runs GuixSD, but I need to get better at Guix packaging first 🙂

[feschber]

what version are you on? This should be fixed very recently.

[ja-cop]

Oh right, I was using the release from November, I should have tried git main before filing the issue. But I've now reproduced it on the latest git main:

$ lan-mouse --version
lan-mouse 0.10.0
tag:latest
commit_hash:89684e14
build_time:2025-02-21 15:05:53 +01:00
build_env:rustc 1.83.0 (90b35a623 2024-11-26),stable-x86_64-unknown-linux-gnu

Also, different from the issue you linked, lan-mouse does not crash in my case, it keeps working - moving the local mouse moves it on the remote - I just can't get back to the other screen.

[ja-cop]

For the record, this is how I'm rotating the display output while Sway is running:

swaymsg "output eDP-1 transform 0" # output is natively portrait mode, so this sets it to portrait/tablet mode

And back again:

swaymsg "output eDP-1 transform 90" # output is natively portrait mode, so this sets it to landscape/laptop mode

[feschber]

Could you send a log from the device where the mouse can not exit?

[ja-cop]

Here's a log:
lan-mouse.log

Every time I rotate the screen I see it printing those "active outputs: ..." messages. When it sees "eDP-1 1280x800", that's landscape mode, and "eDP-1 800x1280" is portrait mode.

At the end of the log, lan-mouse exits because I send it Ctrl+C on the terminal. Between the last screen rotation and the exit, there's no log messages, as I can't get the mouse to leave that screen (without either stopping lan-mouse or using the release keybind).

edit:

Also, for completeness, I'm using SwayFX and not vanilla Sway, but it's a fairly minimal fork and I doubt it's relevant:

$ sway --version
swayfx version 0.4 (based on sway 1.9.0)

[feschber]

so it does not stop working every time, am I understanding that correctly?

Also: Could you export LM_DEBUG_LAYER_SHELL=1 before starting lan-mouse? That should show you a green line of pixels, where the capture barriers are.