I can confirm the same behavious as Bernhard, in that I suffer the
random backlight flashes when moving the cursor following a period of
inactivity, and running

xrandr --output LVDS --set BACKLIGHT_CONTROL combination

corrects the problem.

Here are the first lines of lspci:
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory 
Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 
Integrated Graphics Controller (rev 03)

Please ask me for whatever additional information may be required and
I'll provide it.

-- 
[i965] Wierd backlight brightness behaviour looks like flashes on Amilo Si 2636
https://bugs.launchpad.net/bugs/356510
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