Dmesg revealed:
A Google search found:
https://bugs.freedesktop.org/show_bug.cgi?id=75405
There is an easy fix if your Intel graphic chip gives you this problem.
In /etc/X11/ create a file called xorg.conf. If it already exists rename it xorg.conf-yyyymmdd and copy it to xorg.conf, otherwise create a new one. In the new one put:
If you already have that section in xorg.conf then modify it to look like this.
What does it do? Kubuntu 14.04 is defaulting to the faster "sna" acceleration method. This reverts it back to the slower but more stable "uxa" method.
Code:
[187293.994185] [drm] stuck on render ring [187293.994246] [drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0xfecb000 ctx 0) at 0xfed0a04
https://bugs.freedesktop.org/show_bug.cgi?id=75405
There is an easy fix if your Intel graphic chip gives you this problem.
In /etc/X11/ create a file called xorg.conf. If it already exists rename it xorg.conf-yyyymmdd and copy it to xorg.conf, otherwise create a new one. In the new one put:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "uxa"
EndSection
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "uxa"
EndSection
What does it do? Kubuntu 14.04 is defaulting to the faster "sna" acceleration method. This reverts it back to the slower but more stable "uxa" method.