This bug should probably be closed. As explained in this[1] thread, one
needs to append "acpi_osi=" to the grub boot command line in order to
get the brightness hotkeys to work on the lemur (which is basically a
Clevo W840T1).

References:
[1] http://ubuntuforums.org/showthread.php?t=1543836&highlight=lemur+acpi_osi

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Brightness hotkeys dont work
https://bugs.launchpad.net/bugs/602224
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