PermissionError: [Errno 1] Operation not permitted when sudo undervolt --read

[danielelongo14]

Hello, i got this error with Ubuntu 22.03 when executing the command:
temperature target: -5 (95C)
Traceback (most recent call last):
File "/usr/local/bin/undervolt", line 8, in
sys.exit(main())
File "/usr/local/lib/python3.10/dist-packages/undervolt.py", line 457, in main
voltage = read_offset(plane, msr)
File "/usr/local/lib/python3.10/dist-packages/undervolt.py", line 209, in read_offset
write_msr(value_to_write, msr.addr_voltage_offsets)
File "/usr/local/lib/python3.10/dist-packages/undervolt.py", line 82, in write_msr
os.write(f, pack('Q', val))
PermissionError: [Errno 1] Operation not permitted

[p0ll3]

did you find a fix for this issue?

[danielelongo14]

No I'm not using Ubuntu anymore at the moment

[JosefSchoenberger]

This most likely comes from the Lockdown LSM, which prevents direct access on MSRs from userspace. Lockdown is automatically enabled with secure boot, which in turn is enabled by default on Ubuntu.