Failed to set CRTC gamma
Using Debian Bullseye/testing with gnome-shell 3.38.1-2 on the laptop TUXEDO Book BU1406 (Kaby Lake-U), the warning below is logged in the journal:
gnome-shell[619]: Failed to set CRTC gamma: drmModeCrtcSetGamma on CRTC 51 failed: Permission denied
What is the user supposed to do? What permissions are needed?