Disabling KMS just makes the problem appear less often. This is
ultimately a bug in the MSI BIOS, if it chooses to handle the brightness
keys in hardware it shouldn't emit keypress events. The power managers
such as g-p-m, powerdevel, and xfce4-power-manager need to be told to
work around this. For powerdevil patching hal-info would be sufficient
as Felix Geyer has suggested, gnome-power-manager doesn't read this
because it uses xrandr instead of HAL so I don't know how to fix it.
Regarding xfce4-power-manager I don't know either.

This bug is filed against powerdevil, gnome-power-manager, xfce4-power-
manager, and hal-info and these need to be fixed.

-- 
brightness is broken on MSI WIND U100
https://bugs.launchpad.net/bugs/415023
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