@Bryce, I was running up-to-date versions of everything when I initially posted. I just updated and commented-out the "shadow" option in my xorg.conf file as you suggest, restarted the X server and until now, no lockups. But.... the display glitches are back. See the attached screenshot. Should I file a new bug-report for the glitches?
** Attachment added: "Sample screenshot showing glitches" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/732304/+attachment/1939479/+files/corrupted-menu.png -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/732304 Title: Intel sandy-bridge dual-head GPU hang _______________________________________________ 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