This is the longest I've run without pixellation and/or artifacts in a long time. I'm still not willing to call this workaround a permanent solution though, until I've run a few more tests and had the machine on for a few days. However, here are some instructions on how to boot using the 32-bit kernel and how to set your boot disk to do that permanently: https://discussions.apple.com/message/15700043#15700043
Anke and Zahori, could you try this on your machines to see if it fixes (or reduces) the problems you're seeing?
I'm glad to hear that the 32-bit workaround worked for you, at least by now. Unfortunately, I restarted my machine in 32 bit mode, pressing 3 and 2 during the boot, and I had a crash as usual. I've not tried the permanent change to 32 bit mode, but I assume it won't make any difference.
In 24" iMac Screen Freezes since 10.6.3 update - pls help! discussion they propose to replace the graphic drivers by the ones in 10.6.2, but I don't know where to find those for NVIDIA GT120, and if someone has tried that in NVIDA GeForce equipped machines. Any clue from someone there?
Finally, it would be good to hear if someone who was experiencing these issues has seen any difference while testing Mountain Lion Beta versions...
I think I've found where the "issue" is on my machine, once I saw this post Re: 24" iMac Screen Freezes since 10.6.3 update - pls help! from Eclipsethegalaxy. I've installed smcFanControl in my iMac and set the Optical Drive Fan to around 2100 rpm as minimum, to cool down the GPU, and apparently it works. It seems that the failure happens once the GPU diode reach about 50º or GPU Heatsink reaches about 45º. Please try this patch and let know if it works for you too.
I have a 24in iMac early 2009 with a 3.06 Ghz Intel Core 2 Duo, 4GB 1067Mhz DDR#, Nvidia GeForce GT 130 512 mb, currently running Lion 10.7.4 and am getting all the screen oddities that have been posted here.
I have not yet tried running in 32 bit, but did just now install the smcFanControl. We'll see what happens.
Since forcing the computer to boot in 32-bit mode, I only had 2 chrashes. The first seemed to show some pixellation but the second was just a hang while playing a video (I might have restarted too quickly, I am becoming less and less patient with these lockups).
However, running in 32-bit mode and bumping up the ODD fan up to 2100 with smcFanControl, I have had absolutely no crashes yet (knocks on wood).
Our current working theory (here at work) is that the 64-bit Snow Leopard and Lion kexts contain a bug which pushes the GT 120 and GT 130 GPUs beyond a certain temperature threshold, often causing permanent damage to the card. The 32-bit kexts push the GPU less and thus operate it at lower temperatures (although in some cases the temperature can climb beyond the threshold). Running the smcFanControl with the ODD fan at 2100 or higher seems to be the best solution so far to mitigate issues (whether running in 32-bit or 64-bit). I'm sticking to 32-bit for now though since I don't notice any added benefits from 64-bit.
When I first tried 32 bit it crashed my machine. I have not yet tried it again.
However with smcFanControl running at 2322rpm I have not had a crash today. SFC is telling me though that the temp in my machine is 109ºF. (Actually the reading bounces around all over the place.) Are iMacs supposed to be that hot or is this app inacurate?
Here is one of my crashes, has happened with Ilol (a game that uses wine) and i thought it was the wine doing stuf to the computer, so i stopped playing. Evrything was fine, however i just started playing Diablo 3 and it happened again. It seems to happen with applications that need graphic power.
Interval Since Last Panic Report: 14511 sec
Panics Since Last Report: 2
Anonymous UUID: BCDB9C41-8FA0-4AD0-8105-33D96B1681E8
Fri May 18 17:17:48 2012
panic(cpu 1 caller 0xffffff7f80afa947): NVRM[0/1:0:0]: Read Error 0x00002500: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xe2000000 0xffffff808049d000 0x092480a2, D0, P3/4
Backtrace (CPU 1), Frame : Return Address
0xffffff807f4ab5e0 : 0xffffff8000220792
0xffffff807f4ab660 : 0xffffff7f80afa947
0xffffff807f4ab6f0 : 0xffffff7f80e66c76
0xffffff807f4ab730 : 0xffffff7f80e53867
0xffffff807f4ab7b0 : 0xffffff7f80e4854d
0xffffff807f4ab8c0 : 0xffffff7f80bd8fc3
0xffffff807f4ab900 : 0xffffff7f80c58419
0xffffff807f4ab9e0 : 0xffffff7f80c59b69
0xffffff807f4abad0 : 0xffffff7f80e474b4
0xffffff807f4abb60 : 0xffffff7f80e53f11
0xffffff807f4abcf0 : 0xffffff7f80e8ca1f
0xffffff807f4abe10 : 0xffffff7f80c09bed
0xffffff807f4abe40 : 0xffffff7f80b042c2
0xffffff807f4abef0 : 0xffffff800063c5b6
0xffffff807f4abf30 : 0xffffff800063b330
0xffffff807f4abf70 : 0xffffff800063b1d4
0xffffff807f4abfb0 : 0xffffff8000820057
Kernel Extensions in backtrace:
dependency: com.apple.iokit.IOPCIFamily(2.6.8)[F63D4ABE-42DA-33EF-BADD-3415B0CB0179]@0xffff ff7f80821000
dependency: com.apple.iokit.IONDRVSupport(2.3.2)[D05CFB53-FB72-3613-8162-2D188DB04738]@0xff ffff7f80a88000
dependency: com.apple.iokit.IOGraphicsFamily(2.3.2)[2D2A4A31-EB4F-3730-BE3A-76C061685FC5]@0 xffffff7f80a50000
dependency: com.apple.NVDAResman(7.1.8)[560E1257-BF5E-3B0B-95F0-15033A0D1B97]@0xffffff7f80a 9a000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
Darwin Kernel Version 11.4.0: Mon Apr 9 19:32:15 PDT 2012; root:xnu-1699.26.8~1/RELEASE_X86_64
Kernel UUID: A8ED611D-FB0F-3729-8392-E7A32C5E7D74
System model name: iMac8,1 (Mac-F227BEC8)
System uptime in nanoseconds: 346276578791
last loaded kext at 74325452585: com.apple.filesystems.udf 2.2 (addr 0xffffff7f81f9c000, size 274432)
last unloaded kext at 172689634354: com.apple.driver.AppleFileSystemDriver 13 (addr 0xffffff7f81ed5000, size 12288)
Model: iMac8,1, BootROM IM81.00C1.B00, 2 processors, Intel Core 2 Duo, 3.06 GHz, 4 GB, SMC 1.30f1
Graphics: NVIDIA GeForce 8800 GS, NVIDIA GeForce 8800 GS, PCIe, 512 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR2 SDRAM, 800 MHz, 0x7F7F7F7FCB000000, 0x202020202020202020202020202020202020
Memory Module: BANK 1/DIMM1, 2 GB, DDR2 SDRAM, 800 MHz, 0x7F98000000000000, 0x393955353239352D3032322E4130304C4620
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8C), Broadcom BCM43xx 1.0 (22.214.171.124.15)
Bluetooth: Version 4.0.5f11, 2 service, 11 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: WDC WD5000AAKS-40YGA1, 500.11 GB
Parallel ATA Device: MATSHITADVD-R UJ-875
USB Device: Keyboard Hub, apple_vendor_id, 0x1006, 0xfa200000 / 2
USB Device: Razer Naga, 0x1532, 0x0015, 0xfa230000 / 4
USB Device: Apple Keyboard, apple_vendor_id, 0x0221, 0xfa220000 / 3
USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0xfd400000 / 2
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x5d100000 / 2
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x1a100000 / 2
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x820f, 0x1a110000 / 3
I have a similar issue and it only appeared since I upgraded to LION.
After the computer has gone to sleep or the screen saver kicks in, the user logon icons are not visible when you initially move the mouse.
You have to use the mouse cursor like a white board rubber and move it accross the icons to wipe away the screensaver that has frozen in place.
This will then allow you to proceed to the logon screen.
Has anyone one else experienced this, is the issue similar to what is being discussed?
27-inch, Mid 2010
Memory 12 GB 1333 MHz DDR3
2.8 GHz Intel Core i5
Mac OS X Lion 10.7.3 (11D50b)
ATI Radeon HD 5750 1024 MB
Sorry, the issue you are describing is different from the issue described here. Your GPU is also a completely different one. The issue here is a specific one to NVIDIA GeForce GT 130 (and GT 120) and has to do with a new kernel extension introduced sometime during Snow Leopard that seems to push these cards beyond a certain temperature limit/specification.
I wish you the best in finding the solution to your problem, but the graphic artifacts you describe are entirely different from the ones we have described and pictured in this thread.