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Q: NVDA(OpenGL): Channel exception!
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Aug 15, 2009 8:03 AMby Witch,I have 10.5.8 now and still have same problem.
It seems now I can triger the exception with only resizing the EyeTV window by dragging the conrner with mouse:
15.08.09 16:07:49 kernel NVDA(OpenGL): Channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
15.08.09 16:07:49 kernel 0000000b
As I did not get Apple care in time, it looks like I will not get help from them. Asking the shop in time did not help and it was not reproducable, happened after running SL an hour or more and mot with any other app.
I guess either I have to try to replace the graphic card myself though this can be just spending money in vain or I have to return to my good old PPC machines and forget about any new apple computers.
If anybody from Germany knows, what else I can do, that would be great. The computer is only a bit more than 1 1/2 year old. Far too early to replace it. -
Aug 17, 2009 11:16 AMby Michael Hammarnejd,Sad to say, we did run into problems.
In a graphics intensive java-game (Runescape), resizing the window froze the puter. System log says the same stuff as before/above.
Shize!
Apple has not told me anything worthy of quoting, so my guess is that they are in the dark on this, as we all seem to be.
Strange that this problem only occurs occationally, and only after some time of use/system update or such.
Plz announce if any of you recieves a credible and worthwhile answer from Apple. -
Aug 17, 2009 3:35 PMby Benjamien Mahler,Same problem here,
iMac24 (late 2006) with 7600 GT (3022) crashes everytime when using photoshop CS4 (and "Enable OpenGL drawing" on) and gives the "channel exception" error, even with FanControl . Switching the OpenGL off makes Photoshop usable, but not every app let's you do that -
Aug 18, 2009 5:36 AMby Witch,I called apple Germany yesterday.
The support said:
- They are not aware of a problem with iMacs
- There is no replacement program like now for MacBook and Georforce 8600
- In my IMac the graphic card cannot be changed, the complete logic board would be needed to be replaced (not sure if that is true)
Replacement of logic board might cost about 2/3rd of what I payed for the iMac, so that is not really an option, especially as I have no clue, if the problem will persist afterwards.
As System Upgrades change the problem we still do not know now if it can be solved with other driver. As smcFanControl seems to delay the freezes, there is hardware problem at least. But why then does the behaviour change with system upgrades? From kernel panics to less often and more often freezes after each OS Update/upgrade?
Wenn I had the kernel panics on OSX 10.4 I sent apple lots of crash reports.
When it all started LL as the company behind SL said, it is an apple fault (though others had same problem) while Apple blamed the application programmers.
Now that there are many threads and it applies not only to using Second Life or games with extended graphics usage we get some more info from each other but still nothing at all from apple.
I found some news that apple will not use Nvidia any longer due to problems at beginning of august and and a denial from apple at 7th of august. and there is an article which seems to confirm, that there is a hardware problem: http://www.9to5mac.com/nvidia-display-cards (you may want to have a look at the sources linked there, too).
If anybody knows, for which iMac 24" this (http://sap-dba.blogspot.com/2009/08/replacing-video-card-in-late-2006-24.html) would work, it would be really nice if you told us. -
Aug 19, 2009 10:52 AMby rizon,... same here...
posted at: http://discussions.apple.com/thread.jspa?threadID=2121040&stqc=true
i've been struggling since 10.5.7 & 10.5.8 with tons of freezes... daily... it drives me nuts.
Googling the problem seems that many many users are experiencing the same problem.
I tried several suggested solutions as:
_repairing permissions
_smc fancontrol
none of them help.
It was difficult to determine what caused it since it happened random, one of the things that scored the most was taking screenshots and pasting them in photoshop.
Now i found one action that always freezes the system, which is the magic bullet looks plug in for After effects.
Googling this new info lead to the result it has probably have to do something with the NVIDIA 7300 graphicscard.
Any possible solution out there? -
Aug 20, 2009 6:37 AMby jfmori,I've talked to a NVIDIA Product Manager at Siggraph in New Orlean 2 weeks ago. They were not aware of the problem.
He told me NVIDIA need to fix the problem and submit the new video card driver to Apple. He told me they will look into it, but I'm suspicious if they will actually do something about it.
This need to be fix NOW ! I can't work in my 3D application with the latest Mac OS version. This is causing a lot of problem in my production pipeline.
I would buy a new video card if it would fix the problem, but since I have a MacPro of first generation, there is pretty nothing I can do. Believe me I tried every which way. The only thing to fix the problem is to revert to 10.5.6 -
Aug 21, 2009 12:57 AMby rizon,i can hardly believe they are not aware of this... since its been going on for a while now, not Apple Style... downgrading to 5.6 i actually don't dare to do anymore
which video card would be a good option at this moment?
my specs are: MacPro2,1 Quad-Core Intel Xeon / 3GHz -
Aug 21, 2009 6:33 AMby Witch,Afaik only the 7300 GT and the 7600 GT wil fit into the iMac with exchangable graphic card.
Awareness: One of the threads here abouzt freezing issues has more than 30,000 views. And as I pointed out Apple and Nvidia seem to share costs for excahnging graphic cards for apple care users and for the MacBook.
But some other news. I did search a program getting the temperatures to log them.
Then I started pixels from the Developer Tools Application examples in OpenGL section.
I was watching video and the computer had been freezing night before but was not shutdown as I did not watch and it wanted me to close a window.
I was watching video before and temperature of temp diode on graphic card was at 52°C.
Nothing did happen, when running pixels.
Then I closed pixels and ran Second Life, went to same point where it froze last night and did the same I did there before - nothing happened. Temperature of temp diode was now at 56 degrees.
Then I did fly to another place with my avatar in Second Life and walked and watched. Was not high graphics load though. But it started to freeze after some minutes (temp now at 57°C for just a moment and power supply at 59).
Screen got damaged totally including menu. I have been able to start screnshot program in time this time and got some nice screenshots from what happend then.
After a while (7 minutes later and after loosing the connection to SL Server screen started to show some parts of the windows on it again and step by step parts of the menu. But the Apple in the left now (half an hour later) is still a black square. Syslog (Console/All Messages) has stopped to show NVDA Errors long time ago. Beside the Apple not showing up, I cannot access any of the menus, it shows the shadow of the nenu windows, but no background and no content, For some of them I can click and see the menu content for a moment, but it does not stay.
I am quite sure that what happens just now not having NVDA errors any longer is not an Nvidia problem but a problem with my system not working properly any longer.
Am I right that this is a sign for not only being a graphic card issue but also a kernel problem?
For me it looks like mem being overwritten somwhere. And we should not forget about the issue going worse, when upgrading to 10.5.7.
I really have been thinking about changing graphics card. But when it comes back then? 400 Euro for nothing?
And I changed to Mac not to have costs for exchanging things all the time like with my PCs prior to 2001.
BTW: If I restart finder now, it alwas opens finder windows, I have been closing before. Can that be a graphic card issue? It must be an OS issue being triggered by the freeze before. -
Aug 23, 2009 1:19 PMby Winfer,Hello Witch,
I am from Germany, too.
Save your money and do not exchange anything.
I am still on AppleCare and have my third 7600GT and my second logic board installed. Solved nothing, I have more crashes than before.
please see details at
http://discussions.apple.com/messageview.jspa?messageID=10035457 -
Aug 23, 2009 3:34 PMby jfmori,Apple changed my logical board, all my Ram, an they replaced my Nvidia 7300 GT card for another one. It didn't resolved the problem. The only way to use my MacPro is by reverting back to Mac Osx 10.5.6. Now it's working fine. So I have setup my HD to run either 10.5.7 or 10.5.6.
Mac Pro crash all the time with my 3D Application under 10.5.7 but NEVER under 10.5.6
So this prove the Nvidia 7300 GT card is not the source of the problem but the video driver.
The problem IS IN THE VIDEO CARD DRIVER UPDATE that's in Mac Osx 10.5.7 -
Aug 24, 2009 3:43 PMby Witch,10.5.7 made it just worse for me. But the error in the topic is still the same as it happend less often up to 10.5.6.
Verify which erros you have in syslog like this:
Open Console.app from utilies (German: Konsole.app)
open the list of logs pressing the button left
choose all messages
then filter by "NVDA" to see the latest messages in logs -
Aug 24, 2009 5:48 PMby Witch,Winfer: That does not give much hope.
About Software or not: Whatever you start, it uses a driver for the graphics card, and the Nvidia driver will not be much different for windows and OS X.
I may have asked that already: Did anybody gettign the errors and damaged screen try to set another graphic card driver using OpenGL profiler? It sets the driver to use with an app. The bad: you have to do that every time using the app again.
