Comment 27 for bug 201933

@Mike Gratton and vervelover
I guess it is the best to open a new bug report for your issue since this one is fixed for i915.

It is a good idea to recheck your issue with a newer Intel drive from Debian sid. You have to remove the old i810 driver because the new one doesn't work parallel.
sudo apt-get remove xserver-xorg-video-i810 xserver-xorg-video-all
Download the current driver from http://mirrors.kernel.org/debian/pool/main/x/xserver-xorg-video-intel/xserver-xorg-video-intel_2.3.1-1_i386.deb and install it.
After that restart X and check if your problem is gone. If it still doesn't work it is the best to report it upstream.

If you want to reset everything do the follow commands.
sudo apt-get remove xserver-xorg-video-intel
sudo apt-get install xserver-xorg-video-all

Afterwards you will have the standard hardy driver again.

Maybe you can also undo this patch and compile the driver and test it. The easiest way is to download the source and dependencies with apt-src install xserver-xorg-video-intel and then remove the file ./debian/patches/16_legacy_backlight_blc_pwn_ctl.patch and also remove the 16. entry from ./debian/patches/series . The driver is compiled with fakeroot dpkg-buildpackage. Afterwards you have a Debian package which could be installed with dpkg -i <packagename>.deb .