Then it doesn't seem to be a Pipe-A problem. You can remove this option.

You could also try a new driver. There is an unofficial package
http://people.ubuntu.com/~bryce/Testing/intel/hardy-i386/xserver-xorg-
video-intel_2.3.1-1ubuntu1~bwh3_i386.deb (AMD64
http://people.ubuntu.com/~bryce/Testing/intel/hardy-md64/xserver-xorg-
video-intel_2.3.1-1ubuntu1~bwh3_amd64.deb) of a newer -intel driver for
Hardy.

To install it you have to remove the old i810 driver before.
sudo apt-get remove xserver-xorg-video-i810 xserver-xorg-video-all

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

And please attach your /var/log/Xorg.0.log with this driver and the
default xorg.conf.

-- 
laptop backlight is turning off
https://bugs.launchpad.net/bugs/247315
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