Comment 12 for bug 1015297

> I've noticed that this is *not* happening in Unity or KDE. However, it *does* occur with both Xfce (known) and LXDE.

That indeed sounds related to 2D vs. 3D, but all of these desktops use a different window manager. So the bug could be anywhere between the Mesa and Linux layer.

Alex mentioned that this could be a pm-utils bug. At least the original bug reporter is using fglrx, that should disable all pm-utils quirks. However, to make double sure that it's not that, can you please try the following:

 - Reboot your computer so that we are starting from a clean slate.
 - Open a terminal window.
 - Type "sync" and Enter
 - Type "echo mem | sudo tee /sys/power/state" and Enter; this should trigger a suspend
 - Wake the computer up again.

Do you see the problem now? If so, please do the following:

 - Reboot your computer again.
 - Trigger a suspend by closing the lid or from the menu, etc.
 - Resume
 - Verify that you see the screen corruption now.
 - Attach /var/log/pm-utils.log

Thanks!