Odd screen glitches in Snow Leopard. GPU Fault?

[mackarone]

system.log and kernel.log at glitch occurrence

Here is the system log during the last occurrence of the glitch:

Jun 1 15:10:06 Imac24 loginwindow[47]: in pam_sm_authenticate(): Failed to determine Kerberos principal name.
Jun 1 15:11:20 Imac24 Mail[253]: Periodic CFURLCache Insert stats (iters: 2515) - Tx time:0.318888, # of Inserts: 20, # of bytes written: 213729, Did shrink: NO, Size of cache-file: 19085312, Num of Failures: 0
Jun 1 15:14:27 Imac24 [0x0-0x80080].com.google.Chrome[928]: [0601/151427:WARNING:/b/slave/chrome-official-mac/build/src/chrome/app/breakpad_mac.mm(62)] Breakpad disabled
Jun 1 15:14:35 Imac24 sandboxd[8236]: Google Chrome He(8232) deny mach-lookup com.apple.windowserver.session
Jun 1 15:14:36 Imac24 [0x0-0x80080].com.google.Chrome[928]: [0601/151436:WARNING:/b/slave/chrome-official-mac/build/src/chrome/app/breakpad_mac.mm(62)] Breakpad disabled
Jun 1 15:14:37 Imac24 [0x0-0x80080].com.google.Chrome[928]: Debugger() was called!

And here is the kernel log:

Jun 1 15:10:13 Imac24 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x6 = Fifo: Parse Error
Jun 1 15:10:13 Imac24 kernel[0]: 00000069
Jun 1 15:10:16 Imac24 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = GR: SW Notify Error
Jun 1 15:10:16 Imac24 kernel[0]: 0000006b
Jun 1 15:10:16 Imac24 kernel[0]: 00100000 00004097 00016877 00000002
Jun 1 15:10:16 Imac24 kernel[0]: 000190ea 000008c0 02bde518 00000002
Jun 1 15:10:16 Imac24 kernel[0]: 00000000 beef9601 00000000
Jun 1 15:12:16 Imac24 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = GR: SW Notify Error
Jun 1 15:12:16 Imac24 kernel[0]: 0000006b
Jun 1 15:12:16 Imac24 kernel[0]: 00100000 00004097 00016877 00000002
Jun 1 15:12:16 Imac24 kernel[0]: 000190ea 00001e94 02bde518 00000002
Jun 1 15:12:16 Imac24 kernel[0]: 00000000 beef9601 00000000
Jun 1 15:12:24 Imac24 kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x6 = Fifo: Parse Error
Jun 1 15:12:24 Imac24 kernel[0]: 00000069

And the windowserver log:

Jun 01 15:11:52 [89] CGXRunOneEventPass: timed out after 1 events with wait time of 0.010000
Jun 01 15:13:06 [89] kCGErrorFailure: CGXDisableUpdate: UI updates were forcibly disabled by application "Microsoft Word" for over 1 second. Server has re-enabled them.
Jun 01 15:19:03 [89] CGXRunOneEventPass: timed out after 2 events with wait time of 0.010000
Jun 01 15:19:38 [89] kCGErrorFailure: CGXDisableUpdate: UI updates were forcibly disabled by application "Pages" for over 1 second. Server has re-enabled them.
Jun 01 15:24:47 [89] CGXRunOneEventPass: timed out after 1 events with wait time of 0.010000
Jun 01 15:30:12 [89] CGXRunOneEventPass: timed out after 1 events with wait time of 0.010000
Jun 01 15:35:58 [89] CGXRunOneEventPass: timed out after 2 events with wait time of 0.010000
Jun 01 15:36:25 [89] CGXRunOneEventPass: timed out after 1 events with wait time of 0.010000
Jun 01 15:37:24 [89] kCGErrorFailure: CGXDisableUpdate: UI updates were forcibly disabled by application "Preview" for over 1 second. Server has re-enabled them.
Jun 01 15:38:43 [89] CGXRunOneEventPass: timed out after 1 events with wait time of 0.010000
Jun 01 15:38:44 [89] CGXRunOneEventPass: timed out after 1 events with wait time of 0.010000

 

[mpfef]

FWIW - 10.6.4 seems to have fixed my graphical glitch problem.

I've been running safari constantly since the 10.6.4 update and haven't seen a single instance of the graphical glitches.

YAY!

 

[cab1024]

FWIW - 10.6.4 seems to have fixed my graphical glitch problem.

I've been running safari constantly since the 10.6.4 update and haven't seen a single instance of the graphical glitches.

YAY!

I'm still having the exact same problem and I'm on 10.6.7. Never happened until Snow Leopard, but that's been a while now.

Here's my setup:
Model Name: iMac
Model Identifier: iMac5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: IM51.0090.B09
SMC Version (system): 1.9f4

ATI Radeon X1600:

Chipset Model: ATY,RadeonX1600
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: ATI (0x1002)
Device ID: 0x71c5
Revision ID: 0x0000
ROM Revision: 113-xxxxxx-139
EFI Driver Version: 01.00.139
Displays:
iMac:
Resolution: 1680 x 1050
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Display Connector:
Status: No Display Connected

Anyone have a fix that can be done without updating to another OS?

thanks,