Don't forget to comment out the lines below in the /etc/init.d/hotkey-setup
do_video () {
VIDEO=`xorg_driver`
case $VIDEO in
intel|ati|radeon)
for x in /proc/acpi/video/*/DOS; do
if [ -e "$x" ]; then
echo -n 7 >$x;
fi
done
;;
esac
}
The DOS valude can be 0-7, but in my hp laptop only 0 and 1 can work.
With DOS = 1 the BIOS will do every thing and no notification to the OS.
With DOS = 0 the BIOS will alway notify the OS, but do nothing himself.
If we set the DOS to 0 then we need some write some script in the
/etc/acpi to handle the video switch event.
--
Lid switch don't work on hp NC6000 laptop
https://bugs.launchpad.net/bugs/321153
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