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[James Baldassari <jbaldassari@xxxxxxxxx>]

I'm using the latest 2.6.39 kernel from the kernel PPA, and I'm
experiencing the same issue.  I've also tried the drm-intel-next-
proposed kernel and had the same problems.  I'm using a Lenovo T510.
Here's the lspci for the graphics controller:

00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02) (prog-if 00 [VGA controller])
	Subsystem: Lenovo Device 215a
	Flags: bus master, fast devsel, latency 0, IRQ 44
	Memory at f2000000 (64-bit, non-prefetchable) [size=4M]
	Memory at d0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at 1800 [size=8]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: <access denied>
	Kernel driver in use: i915
	Kernel modules: i915

The symptoms I'm seeing are slightly different.  I don't always need to
switch workspaces to trigger the problem.  Sometimes I'll just be
working and then some window (or the desktop wallpaper) will just bleed
through into the foreground (see attached screenshot).

** Attachment added: "740985-Screenshot.png"
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/740985/+attachment/2121858/+files/740985-Screenshot.png

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https://bugs.launchpad.net/bugs/740985

Title:
  [gm45] screen artifacts when switching desktops with metacity