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. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1967274 Title: Screen sometimes can't update on Intel Alder Lake GPUs [Failed to post KMS update: CRTC property (GAMMA_LUT) not found] To manage notifications about this bug go to: https://bugs.launchpad.net/mutter/+bug/1967274/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
