/sys/class/backlight I have:
Where the first is brought-in, I guess, by
dell_laptop module, while the second comes from
i915. Trying to adjust screen brightness works with
intel_backlight only (by echoing values), while trying to fiddle with other makes no change, with no errors.
The problem is that gnome3 menu settings, and the hotkeys, both try to work around
dell_backlight (the hotkeys management should be in
Is there a way to make GNOME use the other, by some setting in gconf maybe? Or just to rewire the hotkeys and the slider to some script?
My laptop has a:
Intel Corporation Haswell-ULT Integrated Graphics (rev 09) (prog-if 00 [VGA controller]) Subsystem: Dell Device 060a [...] Kernel driver in use: i915
This works (with gnome running or not):
echo 250 > /sys/class/backlight/intel_backlight/brightness
This does not:
echo 250 > /sys/class/backlight/dell_backlight/brightness
I know that gnome-shell is trying to adjust dell_backlight and not intel_backlight, because using the brightness slider in the tray menu, I can read value changes in dell_backlight.