IMac 27 GPU Error With Mountain Lion - Frozen

7/27/12 2:04:26.000 AM kernel[0]: AMDBartsGraphicsAccelerator: ** Device in slot: SLOT--1 **
7/27/12 2:04:26.000 AM kernel[0]: ** GPU Debug Info Start **
7/27/12 2:04:26.000 AM kernel[0]: 0x00006720
7/27/12 2:04:26.000 AM kernel[0]: 0x00000091
7/27/12 2:04:26.000 AM kernel[0]: 0x00000001
7/27/12 2:04:26.000 AM kernel[0]: 0x00000018
7/27/12 2:04:26.000 AM kernel[0]: 0x0000a880
7/27/12 2:04:26.000 AM kernel[0]: 0x00000001
7/27/12 2:04:26.000 AM kernel[0]: 0x00000001
7/27/12 2:04:26.000 AM kernel[0]: 0x00006720
7/27/12 2:04:26.000 AM kernel[0]: 0x00000001
The Hex codes just keep going until I press the hard power button.
I can only see error mesage after restarting. As the how computer is frozen.
Thanks,
Josh

I have this same exact issue. Screen freezes, if you let it sit there long enough without a hard reboot, it will kernel panic.
Stats
iMac 27 inch, 2.8 GHz Intel Core i7, 12 Gb 1067MHz DDR3, ATI Radeon HD 4850 512 Mb
Mac OS X Lion 10.7.5
I hope Apple will do something about this, it seems to be a very common problem now with 10.7.5 and 10.8.2.
If anyone has any ideas to fix this please holler!
kernel.log
Oct 24 17:49:59 Marks-iMac kernel[0]: ** Device in slot: SLOT--1 **
Oct 24 17:49:59 Marks-iMac kernel[0]: ** GPU Debug Info Start **
Oct 24 17:50:00 Marks-iMac kernel[0]: 0x0000944a
Oct 24 17:50:00 Marks-iMac kernel[0]: 0x000000cd
Oct 24 17:50:00 Marks-iMac kernel[0]: 0x00000001
Oct 24 17:50:00 Marks-iMac kernel[0]: 0x00000018
Oct 24 17:50:00 Marks-iMac kernel[0]: 0x0000d062
Oct 24 17:50:00 Marks-iMac kernel[0]: 0x00000001
Oct 24 17:50:00: --- last message repeated 1 time ---
Oct 24 17:50:00 Marks-iMac kernel[0]: 0x0000944a
Oct 24 17:50:00 Marks-iMac kernel[0]: 0x00000001
Oct 24 17:50:00 Marks-iMac kernel[0]: 0x00000015
Oct 24 17:50:00 Marks-iMac kernel[0]: 0x00000000
... This repeats several hundred times after this.

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