Hello,
I am running Ubuntu Lucid on my Samsung P560 notebook
- Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller
- Linux 2.6.32-25-generic #46~ppa1~loms~lucid-Ubuntu SMP Fri Oct 22 23:33:19 UTC 2010 i686 GNU/Linux
The modules easy_slow_down_manager and samsung_backlight are successfully loaded.
If I try to change the brightness via fn keys + "up/down" gnome desktop shows the changes,
but there is no effect to the real brightness. After analysing the /proc and /sys file system
I have found following entries
Code:
/proc/acpi/video/GFX0/DD04/brightness
/sys/devices/virtual/backlight/acpi_video0/brightness
which represent the settings/changes by the fn keys. However, there is another entry
(managed by the samsung_backlight module)
Code:
/sys/devices/virtual/backlight/samsung/brightness
which is not affected by the fn keys. But I can successfully change the brightness of
the backlight on the command line:
Code:
bash> echo 2 > /sys/devices/virtual/backlight/samsung/brightness
Can anybody help me to solve the problem?
Kind regards
Andreas
