Comment 89 for bug 415023

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.