Applied the patch described at the upstream bug https://bugs.freedesktop.org/show_bug.cgi?id=70254, which seems to fix the issue described by this bug.
You can find the git tree at http://kernel.ubuntu.com/git?p=rsalveti /ubuntu-trusty.git;a=shortlog;h=refs/heads/intel-lenovo-x220 and the kernel packages at http://people.canonical.com/~rsalveti/intel/ Would be nice if anyone could install such kernel and give enough feedback to see if indeed fixes the issue, so I can push them to the kernel team. ** Bug watch added: freedesktop.org Bugzilla #70254 https://bugs.freedesktop.org/show_bug.cgi?id=70254 ** Also affects: xserver-xorg-video-intel via https://bugs.freedesktop.org/show_bug.cgi?id=70254 Importance: Unknown Status: Unknown -- 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/1239186 Title: [Lenovo ThinkPad X220] External screens shut off randomly To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1239186/+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
