The problem seems to have stopped. The most probable cause was that I was (rather bravely) running BOINC computations on my GPU!! Since I stopped doing this, my graphic display is much more stable. No more crashing at every thunderbird's newmail
** Changed in: xserver-xorg-video-ati (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/1006489 Title: Xorg freezes upon clicking "new mail" in thunderbird To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1006489/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp