Ubuntu
mutter package

  1. Bug #1967274
  2. Comment #13

Comment 13 for bug 1967274

Revision history for this message
AceLan Kao (acelankao) wrote : Re: Screen sometimes can't update on Intel Alder Lake GPUs [Failed to post KMS update: CRTC property (GAMMA_LUT) not found]

Confirmed with fresh installed Jammy release(5.15.0-23). After the screen dim, the backlight power is off, "/sys/class/backlight/intel_backlight/bl_power", and can't echo 0 to it to light up.

Switch vt(ctrl+alt+F1) works, and then I can turn off and turn on the backlight by
   echo 4 | sudo tee /sys/class/backlight/intel_backlight/bl_power
   echo 0 | sudo tee /sys/class/backlight/intel_backlight/bl_power

Close the lid and then open it, got the same behavior as meta+l, can't turn on the backlight.