Bug#563423: xserver-xorg-video-intel: X crashes, [drm:i915_get_vblank_counter] *ERROR* trying to get vblank count for disabled pipe 0

[Clint Adams <schizo@debian.org>]

Package: xserver-xorg-video-intel
Version: 2:2.9.1-1

I have a reliable way to crash X: launching an xterm and
then viewing a series of photos in ImageMagick.  If I start
other programs beforehand, it crashes on an earlier picture
in the series.

dmesg consists mainly of things like
[353753.446736] [drm:i915_get_vblank_counter] *ERROR* trying to get vblank count for disabled pipe 0
[353753.456574] mtrr: no MTRR for d0000000,10000000 found
[353831.764709] [drm:i915_get_vblank_counter] *ERROR* trying to get vblank count for disabled pipe 0
[353831.773627] mtrr: no MTRR for d0000000,10000000 found

There is nothing worth mentioning in /var/log/Xorg.0.log or ~/.xsession-errors.