Comment 4 for bug 316000

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Bryce Harrington (bryce) wrote : Re: [iGM45,Intrepid] Screen corruption when enabling/disabling external monitor with compiz

This sort of sounds like another GM45 lockup error that was recently fixed:
https://bugs.freedesktop.org/show_bug.cgi?id=17292

Please test with latest updates to Jaunty and see if the bug still exists.