As far as I can tell this problem seems to be fixed with the new intel driver.
xserver-xorg-video-intel: Installiert: 2:2.19.0-0ubuntu1~xup1 Kandidat: 2:2.19.0-0ubuntu1~xup1 Versionstabelle: *** 2:2.19.0-0ubuntu1~xup1 0 500 http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu/ precise/main amd64 Packages 100 /var/lib/dpkg/status 2:2.17.0-1ubuntu4 0 500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages With the default packages in ubuntu precise I still had failing vblank counters in my Xorg.0.log If you take a look at the release notes[1] you can see the following line. - Prevent waiting on scanlines whilst not in control of the VT and therefore whilst referencing foreign CRTC configurations. To my mind this may have solved the problem. I hope this information is helpful for the others that have this issue. –––––––––––––––––– [1] http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/plain/NEWS?id=444da84c47266bcbbdf5121507901de8eb36f11b -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/868684 Title: vblank counter failed - screen hung To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/868684/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs