Brightness can't be controlled although interfaces are available
Submitted by Karol Babioch
Link to original bug (#688052)
Description
Hi,
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 changes, 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