Created attachment 144616 [details] sudo acpidump -o acpidump.txt Hello! I notice when laptop display went off, it keep backlight on. Technically speaking this: # xset dpms force off only set screen to black, without turning off LCD backlight. My kernel has "acpi_backlight=vendor" which enables backlight control from function keys and gnome recognize those actions by displaying popup with current brightness level. Everything seems works fine, I've been able to turn display off using: # echo 0 > /sys/devices/pnp0/00:03/backlight/gmux_backlight/brightness But still no luck with 'xset'. axet@axet-laptop:~$ ls -al /sys/class/backlight/ total 0 drwxr-xr-x 2 root root 0 июн 23 23:13 . drwxr-xr-x 67 root root 0 июн 23 23:13 .. lrwxrwxrwx 1 root root 0 июн 23 23:13 gmux_backlight -> ../../devices/pnp0/00:03/backlight/gmux_backlight axet@axet-laptop:~$ Maybe related: https://bugs.freedesktop.org/show_bug.cgi?id=106869
Created attachment 144617 [details] sudo fwts > fwts
Created attachment 144618 [details] sudo fwts method > fwts_method
Created attachment 144619 [details] sudo dmidecode > dmidecode.log
Created attachment 144620 [details] grep -r . /proc/acpi > acpi
PS: I do not remember, if it is ever worked.
Interesting note. After suspend/resume it starts to work properly.
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