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[Matthias Kretz <kretz@xxxxxxx>]

Following behavior for me:
- Brightness keys show the OSD but don't change anything.
- Adjusting the slider in KDE4's battery applet does change the brightness
- changing the power profile in the battery applet also changes the brightness (as would be expected from the point above)
- volume keys work regardless of the use of the brightness keys

both keys do emit X11 keycodes, i.e. xev shows XF86MonBrightnessDown/-Up
and XF86AudioLowerVolume/...

VGA compatible controller: Intel Corporation Mobile 945GME Express Integrated Graphics Controller (rev 03)
Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)

wild guess:
it seems that the keys work but just don't change the value enough to reach the next "rounded step" (e.g. the allowed values are 0..7 and BrightnessUp tries to change a range from 0..99 from 0 to 10, then getting mapped to the 0..7 range and 10 becomes 0).

-- 
Intel GMA X4500HD - LCD Brightness Control no longer works
https://bugs.launchpad.net/bugs/557635
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