Samsung P560 brightness control via fn keys does not work
Posted: 19 Nov 2010, 21:37
Hello,
I am running Ubuntu Lucid on my Samsung P560 notebook
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
which represent the settings/changes by the fn keys. However, there is another entry
(managed by the samsung_backlight module)
which is not affected by the fn keys. But I can successfully change the brightness of
the backlight on the command line:
Can anybody help me to solve the problem?
Kind regards
Andreas
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
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: Select all
/proc/acpi/video/GFX0/DD04/brightness
/sys/devices/virtual/backlight/acpi_video0/brightness
(managed by the samsung_backlight module)
Code: Select all
/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: Select all
bash> echo 2 > /sys/devices/virtual/backlight/samsung/brightness
Kind regards
Andreas