Bug#615197: "Shadow" option works around for me

[Raimund Steger <rs@mytum.de>]

Hi,

I experience the same problem (I believe) on a ThinkPad x61s with an 
Intel GM965/GL960 graphics adapter.

I can confirm the xpdf behavior. Additionally,

* moving a window over the hands of an xclock
* moving a window over the scrollbar arrows of an rxvt

also causes artifacts.

I use a standard Debian Squeeze 2.6.32-5-amd64 kernel.
The problem occurs with Squeeze's xserver-xorg-video-intel 2:2.13.0-6 
package, as well as with manually built 
libdrm-2.4.23-3/xserver-xorg-video-intel-2.14.0-4 and 
libdrm-2.4.24-1/xserver-xorg-video-intel-2.14.901-1+exp1.

Specifying

  Option "Shadow" "true"

in xorg.conf works around it for me, but if I understand the manpage 
correctly that disables GPU acceleration.

-Raimund