Ubuntu
hal package

  1. Bug #146710
  2. Comment #15

Comment 15 for bug 146710

Revision history for this message
Johannes Ott (bugzilla-informatiker2k3) wrote :

I have same problem here with my Samsung R70 Aura

I have tested following things

1. In a xterm:
root@DarkAngel:/proc/acpi/video/NVID/LCD # cat brightness
levels: 10 30 40 50 60 70 80 100
current: 100

2. After this 2 times „FN+Arrow down“ -> no visible changes to lcd-brightness
Again in xterm:
root@DarkAngel:/proc/acpi/video/NVID/LCD # cat brightness
levels: 10 30 40 50 60 70 80 100
current: 70

3. Changed to console

4.1.1 Press "FN+arrow down" again -> LCD becomes very dark about 60% of before.
4.1.2 Control the brightness in console
root@DarkAngel:/proc/acpi/video/NVID/LCD # cat brightness
levels: 10 30 40 50 60 70 80 100
current: 60
4.1.3 Change back to X-Server brigthness although changed to 60%

Repeat steps 1-3:

4.2.1 Press "FN+arrow up" -> LCD becomes a bit darker about 80% of before.
4.2.2 Control the brightness in console
root@DarkAngel:/proc/acpi/video/NVID/LCD # cat brightness
levels: 10 30 40 50 60 70 80 100
current: 80
4.2.3 Change back to X-Server brigthness although changed to 80%

As a conclusion it seems that the FN-keys doing everything right but x-server or card-driver ("nvidia") are not reacting correctly to the values inside /proc/acpi/video/NVID/LCD/brightness