Firefox 3 displays pieces of desktop background

Kevin Oberman oberman at
Mon Nov 17 08:24:57 PST 2008

> Date: Mon, 17 Nov 2008 07:11:57 +0100
> From: Christoph Moench-Tegeder <cmt at>
> Sender: owner-freebsd-x11 at
> ## Mark Kirkwood (markir at
> > I'm on 7.1 Prerelease refreshed a few days ago. I've noticed that 
> > Firefox 3 (3.0.4, but 3.0.3 was the same) displays snippets from ones 
> > desktop on some webpages (yahoo and youtube being the 2 most recent).
> Image rendering was optimized in Firefox 3, so it breaks with a lot
> of xservers (seems as if some pixmap rendering code is broken in X
> and firefox triggers that problem).
> Try setting Option "XaaNoOffscreenPixmaps" to "true" in the "Device"
> section of your xorg.conf.


Thank yo so much for this suggestion.

I have been annoyed by this odd problem since I started using Firefox3
and this finally make things work correctly. I think this needs to be in
a FAQ somewhere until/unless the Xorg driver is fixed.

In any case, I was seeing this with an ATI Radeon X300 M22 graphics
chipset. I don't seem to see it with my nVidia GeForce 7800 GT based
system. I don't THINK I see it with my old MGA Matrox G450  , but I
won't have my eyeballs in front of that system until next month, si I am
not sure.

Anyone seeing this with any other graphics device that does not use the
RADEON driver?
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at			Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4  EADA 927D EBB3 987B 3751
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