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[mungewell <simon@xxxxxxxxxxxxx>]

I am unable to start either the Ubuntu or Xubuntu LiveCDs (Live mode or
install mode) on my Thinkpad X40 with Intel 855GM. The whole machine
locks up when starting X, last visible message is about starting cups
server.

Following advice in this thread I added to the grub boot parameters:
i915.modeset=0 - gives no improvement, X still locks up machine
i915.modeset=1 - allows X to start and presents first installer window.

For Ubuntu CD this requires careful timing of the 'Esc' key to bring up
the grub menu, which normally whizes past. Too late now to run through
complete install, but hopefully this might help others who are pulling
their hair out.

Cheers and Happy Release Day!
Mungewell.

-- 
[855GM] GPU hang when an application tries to use XVideo
https://bugs.launchpad.net/bugs/554835
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which is subscribed to xserver-xorg-video-intel in ubuntu.