NVDA(OpenGL): Channel exception!

It was Flash-related for me (se eposts above) Really annoying and unpredicatable. ClickTo Flash resolved my problems, although not perfect.

The problem kept coming back and disappear again. At one point it rendered the MacBook useless. Couldn't even start it anymore.

I paid about 150€ to have the graphics chip replaced. Works like a charm, no problems anymore. And with Mavericks, I might actually be able to use this early 2008 MacBook Pro for another 2 years or so.

Has replacing the graphics card really solved your problem?

Or is it back again.

I had my whole logic board replaced for free, but now I have this error. If a graphics card replacement will fix it, I will glady do that.

It has solved the problem for me.

I got it on ebay[1], which obviously only makes sense, if you live in Germany. On the description it says, that they actually replace the graphics chip with a newer version that doesn't have the problem.

[1] http://myworld.ebay.de/lattakia_pc/

Hello All

Apologies for my desperate attempt to revive an old thread. My MacPro 1,1 cannot boot up via the normal sequence only to Safe Mode. I have done a fresh install of Snow Leopard, but I always get the grey screen and spinning wheel of death when I try startup.

Logging into Safe Mode then going to the console log I have noticed lots of these:

kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0x2 = Fifo: SW Method Error

kernel[0]: 00000069

Could my graphics card (NVIDA 7300 GT) be at fault here?

Thank you

I also have the same issue with macbook pro 15" mid 2010

it keeps freezing when this happens.

upadhyay/Library/Containers/com.apple.lateragent/Container.plist

Jul 29 20:04:31 Maheshs-MacBook-Pro.local com.apple.SecurityServer[14]: Killing auth hosts

Jul 29 20:04:31 Maheshs-MacBook-Pro.local com.apple.SecurityServer[14]: Session 100023 destroyed

Jul 29 20:04:31 Maheshs-MacBook-Pro.local com.apple.SecurityServer[14]: Session 100027 created

Jul 29 20:04:36 Maheshs-MacBook-Pro.local com.apple.WebKit.WebContent[892]: CKSoftwareMap: Registering with Daemon

Jul 29 20:04:37 Maheshs-MacBook-Pro.local com.apple.WebKit.WebContent[903]: CKSoftwareMap: Registering with Daemon

Jul 29 20:04:43 Maheshs-MacBook-Pro.local com.apple.WebKit.WebContent[902]: CKSoftwareMap: Registering with Daemon

Jul 29 20:05:39 Maheshs-MacBook-Pro com.apple.launchd[1] (com.apple.qtkitserver[847]): Could not terminate job: 3: No such process

Jul 29 20:05:39 Maheshs-MacBook-Pro com.apple.launchd[1] (com.apple.qtkitserver[847]): Using fallback option to terminate job...

Jul 29 20:07:50 Maheshs-MacBook-Pro com.apple.launchd.peruser.501[286] (com.apple.mdworker.32bit.02000000-0000-0000-0000-000000000000[923]): Job appears to have crashed: Segmentation fault: 11

Jul 29 20:07:50 Maheshs-MacBook-Pro.local ReportCrash[925]: Saved crash report for mdworker32[923] version 800.28 to /Users/mupadhyay/Library/Logs/DiagnosticReports/mdworker32_2014-07-29-200750_Ma heshs-MacBook-Pro.crash

Jul 29 20:10:17 Maheshs-MacBook-Pro kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xc = Graphics Engine Error (GR Error 4)

Jul 29 20:10:17 Maheshs-MacBook-Pro kernel[0]: IOVendorGLContext::ReportGPURestart

Jul 29 20:10:17 Maheshs-MacBook-Pro kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)

Jul 29 20:10:17 Maheshs-MacBook-Pro kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xc = Graphics Engine Error (GR Error 4)

Jul 29 20:10:17 Maheshs-MacBook-Pro kernel[0]: NVDA(OpenGL): Channel exception! exception type = 0xd = Graphics Engine Error (GR Error 5)

Jul 29 20:10:22 --- last message repeated 2 times ---

Jul 29 20:10:22 Maheshs-MacBook-Pro.local apsd[62]: Unrecognized leaf certificate

Jul 29 20:10:37 Maheshs-MacBook-Pro kernel[0]: NVDA(OpenGL): Channel timeout!

Jul 29 20:10:45 Maheshs-MacBook-Pro kernel[0]: process com.apple.WebKit[837] caught causing excessive wakeups. Observed wakeups rate (per sec): 5176; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 92716

Jul 29 20:10:45 Maheshs-MacBook-Pro.local ReportCrash[931]: Invoking spindump for pid=837 wakeups_rate=5176 duration=9 because of excessive wakeups

Jul 29 20:10:57 Maheshs-MacBook-Pro kernel[0]: NVDA(OpenGL): Channel timeout!

Jul 29 20:11:27 --- last message repeated 1 time ---

Jul 29 20:11:27 Maheshs-MacBook-Pro.local spindump[932]: Timed out waiting for agent 501 after 10 seconds

Jul 29 20:11:28 Maheshs-MacBook-Pro.local spindump[932]: No microstackshots found

Jul 29 20:11:37 Maheshs-MacBook-Pro kernel[0]: NVDA(OpenGL): Channel timeout!

People need to pay attention. This is the only solution that worked for someone I was trying to help who cannot afford to buy a new computer or experiment with replacing video cards. I had actually narrowed my goal to removing Nvidia drivers since I know they don't load in Safe Mode, but I was nervous about which ones were safe to remove, since I didn't have physical access to the box (I was afraid she might even lose Safe Mode). Based in this recommendation, I felt comfortable proceeding. It worked like a charm. I'm sure she can't do any serious gaming (no OpenGL after driver removal), but she seems to be able to use her composition software and watch youtube videos without any problem. I really appreciate this solution, agrantfan. More people should pay attention to your post!

agrantfanNov 15, 2012 7:16 AM Re: NVDA(OpenGL): Channel exception!
in response to bulletproof.

I had the same issue. It was related to my NVIDIA GeForce 7300 GT graphics card.

My fix:

I navigated to /System/Library/Extensions and moved all the files starting with NV and GeF to a backup directory on my desktop, then used Kext Wizard option "System/Library/Extensions" to Repair Permissions and to Rebuild Cache, then rebooted.

The computer restarted with no gray screen and no more NVDA(OpenGL) log entries.

I recommend that you try this.