Brightness adjustment won't work



Hi,

I'm currently using GNOME 3.6, but had issues with previous versions
also, so this seems to be something more essential.

I'm not sure what would be the right list to post to, so I'm using the
most general one, maybe someone could point me in the right direction,
so I could get in contact with the right group of developers.

Basically what my problem comes down to is that I can't control the
brightness from within GNOME. When pressing the appropriate keys on my
keyboard, nothing happens. In contrast to that the volume adjustment
works just fine.

The system I'm talking about is a Sony laptop. I've contacted the
maintainer of the sony-laptop kernel module and according to him it
seems to work fine (although he came up with some changed, which in the
mean time were merged into mainline already).

So the appropriate interface(s) in /sys/class/backlight are available,
but for some reason GNOME doesn't recognize them.

Here is a listing of the interfaces, which are available:

[root@vpcs backlight]# ls -lR */*
-r--r--r-- 1 root root 4096 31. Okt 02:01 nv_backlight/actual_brightness
-rw-r--r-- 1 root root 4096 31. Okt 02:01 nv_backlight/bl_power
-rw-r--r-- 1 root root 4096 31. Okt 01:49 nv_backlight/brightness
lrwxrwxrwx 1 root root    0 31. Okt 02:01 nv_backlight/device ->
../../card0-LVDS-1
-r--r--r-- 1 root root 4096 31. Okt 02:01 nv_backlight/max_brightness
lrwxrwxrwx 1 root root    0 31. Okt 01:25 nv_backlight/subsystem ->
../../../../../../../../class/backlight
-r--r--r-- 1 root root 4096 31. Okt 01:44 nv_backlight/type
-rw-r--r-- 1 root root 4096 31. Okt 01:25 nv_backlight/uevent
-r--r--r-- 1 root root 4096 31. Okt 02:01 sony/actual_brightness
-rw-r--r-- 1 root root 4096 31. Okt 02:01 sony/bl_power
-rw-r--r-- 1 root root 4096 31. Okt 01:48 sony/brightness
-r--r--r-- 1 root root 4096 31. Okt 01:51 sony/max_brightness
lrwxrwxrwx 1 root root    0 31. Okt 01:48 sony/subsystem ->
../../../../class/backlight
-r--r--r-- 1 root root 4096 31. Okt 01:48 sony/type
-rw-r--r-- 1 root root 4096 31. Okt 01:48 sony/uevent

nv_backlight/power:
insgesamt 0
-rw-r--r-- 1 root root 4096 31. Okt 02:01 async
-rw-r--r-- 1 root root 4096 31. Okt 02:01 autosuspend_delay_ms
-rw-r--r-- 1 root root 4096 31. Okt 02:01 control
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_active_kids
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_active_time
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_enabled
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_status
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_suspended_time
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_usage

sony/power:
insgesamt 0
-rw-r--r-- 1 root root 4096 31. Okt 02:01 async
-rw-r--r-- 1 root root 4096 31. Okt 02:01 autosuspend_delay_ms
-rw-r--r-- 1 root root 4096 31. Okt 02:01 control
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_active_kids
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_active_time
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_enabled
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_status
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_suspended_time
-r--r--r-- 1 root root 4096 31. Okt 02:01 runtime_usage

Let me know, if there is something more specific you would like to have
and/or need to narrow this down.

Best regards,
Karol Babioch

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