For anyone still having issues on 855 hardware, specifically when switching 
VTs, suspending, shutting down, (or even starting the X server up), and wanting 
to help debug this issue further, I'm put online a .deb (and sources etc..):
http://www2.eng.cam.ac.uk/~pcjc2/ubuntu/debug/
http://www2.eng.cam.ac.uk/~pcjc2/ubuntu/debug/xserver-xorg-video-intel_2.1.1-0ubuntu9~pcjc2.tst_i386.deb

This has the latest ubuntu version of the driver, with all known fixes
that have been pushed to Ubuntu. It has an experimental patch of mine to
avoid blinking the blackight like crazy when starting the server up,
which also has possible side-effects for the load/restore path.

The useful bit, is a load of extra log output at nearly every stage of
the restore path. If its failing there, we should be able to narrow down
where.

I've added calls to sync() after every log messge I added, so
_hopefully_ some of this will make it to disk if the machine hard-locks,
although hardware write-caching on the disk may put pay to that.

You might try disabling that before VT switching with:
hdparm -W 0 /dev/HARD_DRIVE

Those who know how to attach strace from a remote machine will be able
to see everything even if the machine locks.

I'd be interested to see log output from this for anyone who still has
failures. (Running this test version of the driver).

-- 
xserver-xorg-video-intel does not work with 82852/855GM
https://bugs.launchpad.net/bugs/108056
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