@Timo: thanks Timo. Yesterday I switched to xorg-edgers & that seems to be working. Later today I'll pp-purge that and try the 'xserver-xorg-lts-raring' method.
$ apt-cache policy xserver-xorg-video-intel xserver-xorg-video-intel: Installed: 2:2.21.15+git20130821.f57ce6ef-0ubuntu0sarvatt~precise Candidate: 2:2.21.15+git20130821.f57ce6ef-0ubuntu0sarvatt~precise Version table: *** 2:2.21.15+git20130821.f57ce6ef-0ubuntu0sarvatt~precise 0 500 http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu/ precise/main amd64 Packages 100 /var/lib/dpkg/status 2:2.17.0-1ubuntu4.4 0 500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages 2:2.17.0-1ubuntu4 0 500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/747723 Title: Screen Corruption i915 Intel video To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/747723/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs