Almost the same affects my laptop - Sony Vaio VPCYA1C5E - from the beginning of
using Kubuntu from the version 11.04
Current DistroRelease is Kubuntu 12.10
In the folder
/sys/class/backlight
I have two soft-linked subfolder:
lrwxrwxrwx 1 root root 0 Nov 9 20:19 acpi_video0 ->
../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/
lrwxrwxrwx 1 root root 0 Nov 9 20:19 intel_backlight ->
../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/i
If I use hot-keys for backlight adjustment the corresponding values are saved
into the brightness files under
/sys/class/backlight/acpi_video0/
folder but the brightness is not changed. If I call
sudo sh -c 'echo [number] > /sys/class/backlight/intel_backlight/brightness
then the brightness is changed properly accordingly to the provided [number].
Probably hot-keys and system events trigger-scripts is bound to the wrong
folder. But I don't know how to change that binding.
Regards.
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https://bugs.launchpad.net/bugs/1021437
Title:
gnome settings picks the wrong file in /sys/class/backlight to change
the brightness
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