https://bugs.freedesktop.org/show_bug.cgi?id=88152
--- Comment #15 from Arthur Marsh arthur.marsh@internode.on.net --- Upgraded to current Linus git head and tried again.
This time there was no GPU reset associated with starting kdm (which had happened over the last few days), but the lock-up when playing the same video came less than 2 minutes into the video, much sooner than before.