I was afflicted by a similar rolling-ttm_validate hang, see bug#1434396 comment#25 Solution in my case was 'apt-get install pam-kwallet5'
If this helps here too, then it might be worth looking at how events from multiple displays are handled, when they're actually from a common all-displays client (like the lock screen) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1240869 Title: nouveau spits errors and hangs when ubuntu search window is openned To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1240869/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
