The only program I see in your process list that I can imagine /could/
do something with this event would be gkrellm.

Could you check whether the brightness still changes if you stop both
gnome-power-manager and gkrellm?  If so, can you check whether the
brightness changes when you stop both gnome-power-manager and hal?

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Strange LCD brightness up function implementation on the Acer Aspire 5720
https://bugs.launchpad.net/bugs/360795
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