Public bug reported:

After upgrading from Hardy to Intrepid X stopped working for me.

The screen flickers two times and starts to show a RGBWB slideshow, i.e.
the whole screen turns red, green, blue, white, black, ... and changes
every second. X is running fine, as I can switch to console and press
Ctrl+Alt+Del to reboot. The display just continues with the slideshow,
so I have no visual feedback at all.

Booting with an older custom kernel, which was working with Hardy into
"init=/bin/bash" and starting X via startx results in the same error.

The graphics kind of work, if I set ForceEnablePipeA, except that the
whole screen flickers every few seconds, and the Xorg log is flooded
with data, probably because teh driver tries to find connected devices
on VGA and TV. Errors are:

(EE) intel(0): tried to update DSPARB with both planes enabled!
(EE) intel(0): underrun on pipe B!  <== this is the LVDS

The vesa driver is working fine.

I also tried an older 2.3.2 ubuntu package, which was used with 1.4.x, 
recompiled against 1.5 Xorg, which fails with the same symptoms. Next I tried 
patched hardy driver sources - failed too.
The only working version for me is the driver compiled from the vanilla 2.2.1 
sources, where I don't need the "ForceEnablePipeA" option, but which also fills 
my Xorg.0.log with messages.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

-- 
X start crashes i915GM LVDS graphics
https://bugs.launchpad.net/bugs/283192
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