Blacklisting the video module works as a workaround for me, but I think
it's not the real solution. I'm attaching my lshal output after
backlisting the video module.

This is after pressing brightness down hotkey 1 time:

[EMAIL PROTECTED]:~$ lshal -m

Start monitoring devicelist:
-------------------------------------------------
23:00:06.637: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down

** Attachment added: "lshal-video_blacklisted.txt"
   http://launchpadlibrarian.net/14461321/lshal-video_blacklisted.txt

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Screen brightness double level changes
https://bugs.launchpad.net/bugs/207473
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