you could try blacklisting video-module and reboot to see if that helps.. ie. add "blaclist video" to /etc/modprobe.d/local and reboot.
** Changed in: xserver-xorg-video-i810 (Ubuntu)
Status: Unconfirmed => Needs Info
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Changing brightness under lowest value restarts X
https://launchpad.net/bugs/87201
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