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[Launchpad Bug Tracker <1554299@xxxxxxxxxxxxxxxxxx>]

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This is a followup of
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1501260 .

Basically, running OpenGL applications (e.g. glxgears) on the primary
display handled by Intel 915 card results in display freeze. The error
message from the title of this bug is written to a VT console if I
switch to it. It seems this bug only appears when multiple monitors are
connected.

Switching to a VT (Ctrl+Alt+F1) and back unfreezes the screen for a
while. The screen only looks frozen, but normally reacts to mouse and
keyboard events. This only happens if the GL window is displayed on my
primary display (which is handled by the intel integrated chip). The
notebook has 2 video outputs and a discrete AMD graphics, and I think
only one of the outputs is handled by the AMD card, so I think one of
the outputs is handled by the intel card and does not get frozen.

Ubuntu 14.04.3 64bit.

I think that before upgrading from 14.04.2 to 14.04.3 this did not
happen.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-4.2.0-30-generic 4.2.0-30.36~14.04.1
ProcVersionSignature: Ubuntu 4.2.0-30.36~14.04.1-generic 4.2.8-ckt3
Uname: Linux 4.2.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Mar  8 02:43:37 2016
InstallationDate: Installed on 2013-11-05 (853 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: linux-lts-wily
UpgradeStatus: Upgraded to trusty on 2014-04-12 (695 days ago)

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug trusty
-- 
drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in dpll_hw_state.wrpll (expected 0xb0210614, found 0x00000000)
https://bugs.launchpad.net/bugs/1554299
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