There is a very active discussion of this bug on Ubuntu Launchpad (ubuntubug 91966):
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/91966
It contains Xorg.0.log files with debug on showing the symptoms of this bug.
There is a very active discussion of this bug on Ubuntu Launchpad (ubuntubug 91966):
https:/ /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- intel/+ bug/91966
It contains Xorg.0.log files with debug on showing the symptoms of this bug.