intel+945GM: display garbled w. current git and KDM themed login screen

[Jens Stroebel]

			Hello.

I've tried the latest git checkout for xorg today and had to notice that
the greeting screen of kdm, the kde login-manager, gets garbled with
image data after the first logout.

Said image data is obviously from the session that was last terminated
which gets "shuffled" with the background of the themed login screen.
Attempts to capture a screenshot have failed, unfortunately.

lspci for graphics chip:
==============================
00:02.0 VGA compatible controller: Intel Corporation Mobile
945GM/GMS/940GML Express Integrated Graphics Controller (rev 03)
==============================
kde version 3.5.7
qt version 3.3.8

When logging in, the effect vanishes (the screen gets set up correctly);
after logging out again, the background of the KDM login screen is
garbled again.

A non-themed KDM displays correctly.

This is a relatively new behavior; the git checkout of 2007-06-11
behaves correctly in that regard.

		Any ideas where this could come from?

			greets,
			   jens
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