Public bug reported:
Excellent reproducible way to do soft lockup of your X server.
compiz is not required, for me it works with plain metacity.
Works in current Hardy.
open firefox and terminal.
in terminal enter sleep 10; killall -STOP firefox
then in 10 seconds switch to firefox and enter something to location bar to get
new fancy pop-up list, and wait until ff receives SIGSTOP.
now the X server is mostly locked up, albeit some panel applets continue to
refresh.
remedy: login via ssh and killall -CONT firefox
also note that alt-tab is not working when pop-up list is displayed.
firefox isn't required, you may try this with many other custom pop-up menus,
like network-manager tray menu, etc.
hardware - Intel i945GM, but i think this is irrelevant.
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
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xorg lockup
https://bugs.launchpad.net/bugs/223493
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