Created attachment 498951 [details]
Xorg.0.log

Thanks for the bug report.  We have reviewed the information you have provided above, and there is some additional information we require that will be helpful in our diagnosis of this issue.

Please add drm.debug=0x04 to the kernel command line, restart computer, and attach

* your X server config file (/etc/X11/xorg.conf, if available), and
* output of the dmesg command,

to the bug report as individual uncompressed file attachments using the bugzilla file attachment link above.

We will review this issue again once you've had a chance to attach this information.

Thanks in advance.

Created attachment 498953 [details]
dmesg with drm.debug=0x04

No X server config file was necessary to boot the system.
dmesg with drm.debug=0x04 attached.

what version of mesa is installed, can you try a newer mesa/kernel if they are in updates-testing.

I've had a second look at the artefacts, and they looked like a vblank issue
Indeed, launching openarena or quake3-demo with vblank_mode=0 fixes the problem.
Without vblank_mode=0, huge "tearing" is always displayed in the menu and during the game.

I nearly always run the latest from koji, this is what is currently installed on my system:

kernel version:
kernel-2.6.38.7-30.fc15.x86_64
Linux localhost.localdomain 2.6.38.7-30.fc15.x86_64 #1 SMP Fri May 27 05:15:53 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

Mesa / xorg-x11-drv-ati:
mesa-dri-drivers-7.11-0.11.20110525.0.fc15.x86_64
mesa-libGLU-7.11-0.11.20110525.0.fc15.x86_64
mesa-demos-7.10-4.20101028.fc15.x86_64
mesa-dri-filesystem-7.11-0.11.20110525.0.fc15.x86_64
mesa-libGLU-devel-7.11-0.11.20110525.0.fc15.x86_64
mesa-dri-llvmcore-7.11-0.11.20110525.0.fc15.x86_64
mesa-libGL-7.11-0.11.20110525.0.fc15.i686
mesa-libGL-devel-7.11-0.11.20110525.0.fc15.x86_64
mesa-libGL-7.11-0.11.20110525.0.fc15.x86_64
xorg-x11-drv-ati-6.14.1-2.20110525gitfe5c42f51.fc15.x86_64

Summary:

$ openarena
$ quake3-demo
=> tearing

$ export vblank_mode=0
$ openarena
$ quake3-demo
=> no tearing

reproductible with mesa-libGL-7.11-0.14.20110621.0.fc15.x86_64

and:
kernel-2.6.38.8-34.fc15.x86_64 
xorg-x11-drv-ati-6.14.1-2.20110525gitfe5c42f51.fc15.x86_64

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