It sounds like the fairly typical error that UXA is eating the vblank notification whilst DPMS off and not informing the client that they are no longer ignored.
How about trying Option "Triplebuffer" "false"? -- 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/1273832 Title: [i915] Lockscreen/lid-close xserver freeze if UXA accel used. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1273832/+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
