I'm running 16.04 with xenial-proposed enabled and I'm experiencing random freezes like this a few times a day since kernel upgrade about two weeks ago.
$ uname -a Linux vaclav-ntb 4.10.0-19-generic #21~16.04.1-Ubuntu SMP Fri Apr 7 08:20:02 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1684010 Title: 17.04, i915 freeze on VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller Status in linux package in Ubuntu: Incomplete Bug description: Just freezes all unity and/or X. Nothing in any logs though. 16.10 worked just fine. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1684010/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
