I have a similar problem with a Compaq C550. The laptop hardlocks at a
somewhat random time after arriving at the gdm login screen (usually
once logged in). This is rather inconclusive, but the problem also seems
to be accelerated by keyboard or touchpad input. Interestingly, if the
laptop is booted in single-user mode (=recovery mode at grub boot
screen) and the X server started by hand ("startx" as root), it never
locks up.

This only occurs using the current 2.6.22-14 kernel. When booting Gutsy with 
the Feisty 2.6.20-15 kernel, the problem does not appear (drm module <-> X 
server?)
Contrary to Petri's fortune, specifying either the "i810" or "intel" server in 
xorg.conf does not seem to make a difference.
Mode of /dev/dri/card0 is 0666
Card IDs:
00:02.0 0300: 8086:27a2 (rev 03)
00:02.1 0380: 8086:27a6 (rev 03)
C552US, Celeron M 520 1.6


** Attachment added: "xorg.conf"
   http://launchpadlibrarian.net/10058347/xorg.conf

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Xorg (i810) crashes on startup after upgrade to Gutsy
https://bugs.launchpad.net/bugs/152654
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