From owner-freebsd-x11@FreeBSD.ORG  Tue Jun  9 23:41:41 2009
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Date: Tue, 09 Jun 2009 19:41:36 -0400
From: Adam K Kirchhoff <adamk@voicenet.com>
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To: "R. Aditya Kadambi" <rakadambi@gmail.com>
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Cc: freebsd-x11@freebsd.org
Subject: Re: Xorg 7.4 OpenGL issues on FreeBSD 7.2
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R. Aditya Kadambi wrote:
> I am running FreeBSD 7.2 on a amd64 system and seeing some issues with
> OpenGL apps. Le me explain.
>
> My system is:
>
> FreeBSD Intio 7.2-RELEASE FreeBSD 7.2-RELEASE #0: Fri May  1 07:18:07 UTC
> 2009     root@driscoll.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
>
> I am running enlightenment as my WM (However I have seen the same issue with
> KDE too).
>
> Start a mesademo program, say "engine"
>
> The program comes up fine. When I switch to another pager, the opengl window
> is still overlaid. No refresh. Also, menus are invisible on the window. Any
> mesademo program results in the same behavior. I have ATI RV350 card (ATI
> X9550 AGP) and I am running "Radeon" driver.
>
>   

This sounds very similar to:

http://bugs.freedesktop.org/show_bug.cgi?id=21936 and
http://bugs.freedesktop.org/show_bug.cgi?id=21653

In which case you might want to try the patch attached to 21653.

Adam