Arch Linux

Description:
Since the 3.8.x. kernels, the drm and i915 hangs the GPU on X11. (e.g. Lenovo X200, Lenovo T400 with Intel X4500)
See here: https://bbs.archlinux.org/viewtopic.php?id=160186

Steps to reproduce:
Just install the new repo kernels. Shortly after the mouse, screen and keyboard hangs periodically.

Solution:
doing a git bisect from 3.7 through 3.8 on the official git kernel repo the following commit is the culprit:
commit 69787f7da6b2adc4054357a661aaa1701a9ca76f
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Tue Oct 23 18:23:34 2012 +0000

drm: run the hpd irq event code directly

All drivers already have a work item to run the hpd code, so we don't
need to launch a new one in the helper code. Dave Airlie mentioned
that the cancel+re-queue might paper over DP related hpd ping-pongs,
hence why this is split out.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

Reversing this commit on the 3.8 kernels resolve the issue.