I switched to the radeon driver xserver-xorg-driver-radeon and updated the driver name in the relevent xorg.conf stanza. Further experiments show that the lock up seems to be related to changing window focus. In particular from thunderbird or firefox to something else like xchat or a terminal window. I've no idea whther thunderbird or firefox are using non-default visuals or something, and there's a problem in switching.
The mouse click issue might have been because the mouse clicks were on menus that caused a window creation/destruction event and thus the bug appeared to be mouse releated rather than focus related. -- locks up with some mouse clicks https://launchpad.net/bugs/52054 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
