Public bug reported:
Binary package hint: gnome-power-manager
I've got an HP ProBook 4720s with the latest gnome-power-manager installed
(lucid). I've got the following problems:
- the brightness up/down buttons have no effect
- the brightness adjustment applet has no effect and does not correctly display
the current brightness
- the brightness adjustment on ac power online/offline events does not work.
I believe that the problem lies in the actual adjustment of brightness and not
in the correct recognition of the hardware event:
- I can manually read and adjust brightness by reading/writing from/to
/proc/acpi/video/DGFX/LCD/brightness.
- I can attach a script to the brightness up/down key events via Gnome Keyboard
Shortcuts
- I get a correct HAL event via halevt daemon
- I get a correct key name mapping when looking at proc/input/event8 via keymap
- I don't get an output when running gnome-power-manager in verbose mode and
pressing the brightness up/down keys
Unfortunately I'm not a HAL/udev/acpi specialist. I've tried to track
this problem down as far as I could. But now I'm stuck. Anything more I
can do for you to find/fix the root cause of the problem?
** Affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
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Brightness adjustment doesn't work for HP ProBook 4720s
https://bugs.launchpad.net/bugs/592592
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