Given that it only occurs with DRI enabled, this points to a kernel drm bug. Refiling.
If you can still reproduce this you may want to attach kernel logs, etc. Try running apport-collect 853057 ** Package changed: xserver-xorg-video-intel (Ubuntu) => linux (Ubuntu) -- 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/853057 Title: [GM965] reproducible: watching video with DRI will freeze X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/853057/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
