Comment 11 for bug 146710

Experiencing the same behaviour on a Samsung r70 despina with a Geforce 8600m GS .
Using Ubuntu 8.04 LTS 32bit with the latest closed source Nvidia drivers. The bug persists with the latest beta drivers from nvidia 173.08.

The /var/log/acpid file print some information on the keypress fn+up (fn+down):

[Sat May 17 15:59:19 2008] received event "video LCD 00000086 00000000"
[Sat May 17 15:59:19 2008] notifying client 5856[110:122]
[Sat May 17 15:59:19 2008] notifying client 2345[0:0]
[Sat May 17 15:59:19 2008] notifying client 2345[0:0]
[Sat May 17 15:59:19 2008] executing action "/etc/acpi/video_brightnessup.sh"
[Sat May 17 15:59:19 2008] BEGIN HANDLER MESSAGES
[Sat May 17 15:59:19 2008] END HANDLER MESSAGES
[Sat May 17 15:59:19 2008] action exited with status 0
[Sat May 17 15:59:19 2008] completed event "video LCD 00000086 00000000"

the screen stays at maximum brightness though.
This bug only occurs with the "nvidia" drivers. Using not accelerated "nv" drivers the function keys work as they are supposed to do.
The fn+f5 screen-off works without problems, so do all other keys, so it seems this is a driver related problem.
If the x-server is not active, either killed or changed to a vt, brightness works without problems. The mentioned commandsin the comments before to echo in the acpi brightness works only if the terminal is not started out of X.