Confirmed here on an intel i945 too.
I can't really remember what I did to have those crashes but it wasn't only
during alt-tabbing (it was often when scrolling a page on firefox IIRC).
I also tried ctrl+alt+backspace without any result, compiz was taking 100% of
CPU and killing it + reloading X fixed the issue.
** Changed in: compiz (Ubuntu)
Status: New => Confirmed
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Hangs on intel i945 (I think when alt-tabbing)
https://bugs.launchpad.net/bugs/177488
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