Created attachment 142890 [details]
Xorg log before lock screen.
Everytime after resume from a lock screen (monitor suspend), I see the following error from xorg log:
[ 20.962] (II) xfree86: Adding drm device (/dev/dri/card0)
[ 20.962] (EE) /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied
There is no such errors at first boot (before lock screen).
- How to know what is trying to access "/dev/dri/card0"? Where is the log?
- Why it is trying to access "/dev/dri/card0", given that the xorg is started already?
Created attachment 142891 [details]
xorg log after resume from lock screen (monitor suspended)
The log says
systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
Thus the FD is handled manually and for some reason fails on your end. Normally I would suggest adding the -keeptty. If that's not an option please bisect which project/commit cause this issue - kernel, libdrm or Xorg.