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).

My question:

- 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?