Currently Being ModeratedOct 24, 2012 4:16 AM (in response to Magovec)
GPU can die, but can not degrade in speed. Especially if it repoets to system that it is working.
check may be resolution settings...
Currently Being ModeratedOct 24, 2012 4:31 AM (in response to dmdimon)
I was more thinking like... would I be able to spot if one GPU dies? Isn't it that way that if the one dies the other take over? Isn't possible that the system tries to switch, sends the right command but the HW does not answer so it swithes back to the previous one?
This is why I am searching the way how to really confirm if the HW is ok or not. E.g. to see the PCI table if the device is there or "ping" it somehow etc.
Currently Being ModeratedOct 24, 2012 4:41 AM (in response to Magovec)
Isn't it that way that if the one dies the other take over? Isn't possible that the system tries to switch, sends the right command but the HW does not answer so it swithes back to the previous one?
then gfxCardStatus would show fallback one, as reported by one parts of system to other.
As you have gfxCardStatus installed, force one card, than other and compare in report screens below
Currently Being ModeratedOct 24, 2012 4:49 AM (in response to dmdimon)
This seems to work as expected. If I switch to Intel it shows Intel. If to nVidia it shows nVidia.
I also crossed my mind if it is not a problem in the X Server? Somehow the config changed and the video is no longer accelerated? (Honestly do not know if this is possible on Mac, but in case of Linux this used to happen during some curcumstances and with "nv" drivers).
Currently Being ModeratedOct 24, 2012 5:32 AM (in response to Magovec)
practically impossible. Game would not work at all in this case.
check resolution - it may be too high and it can be invisible on Retina.
Currently Being ModeratedOct 24, 2012 6:04 AM (in response to dmdimon)
On a desktop there is no change for me - no laggs or slow response - I cannot say there is a difference. The only difference is in 3D tasks (games, benchmarks). If I switch cards using gfxCardStatus and then check About this Mac > Show more info > Displays is how the same resolution for both cards and it is 2880x1800, which to me it seems OK for Retina.
Currently Being ModeratedOct 24, 2012 9:02 AM (in response to Magovec)
there at nVidia site are mac drivers. Try to install them.
Currently Being ModeratedOct 24, 2012 2:19 PM (in response to dmdimon)
Currently Being ModeratedOct 24, 2012 2:31 PM (in response to Magovec)
Currently Being ModeratedOct 24, 2012 2:55 PM (in response to Magovec)
To show what I am talkin about I did another test. I downloaded and ran LuxMark. There it is possible to test CPU and GPU separately on a same benchmark scene. FIrst I let the system switch to nvidia and did the test:
Then I manually switched to Intel/CPU in gfxCardStatus and also selected CPU in the LuxMark and did the same test. The result is:
You see? How it is possible that in OpenCL computation CPU with internal graphic card is even faster then the descreet one? This is what I am experiencing now and cannot figure out where the problem lies.
Would the Apple HW test discover a dead nvidia card? Because nothing shows that the card is dead but as you can see it is not performing as it should.MacBook Pro with Retina display, OS X Mountain Lion (10.8.2)
Currently Being ModeratedOct 25, 2012 2:39 AM (in response to dmdimon)
I installed CUDA drivers about 2 weeks back. Since then I am using them ok. So it worked with these drivers for almost 2 weeks without problems. It suddenly stopped over night and I am not aware that I installed anything (not even any appliacation) during that time between the last time I know for sure it worked (Monday evening) and the time I discover it does not work (Tuesday evening).
Today I reinstalled these CUDA drivers again and again updated them to the latest version with still the same result. But I think it did not update GPU drivers and I am unable to find pure GPU drivers on nVidia site just to test it.
This is what I do not understand. Normally I would say the nVidia card just died, but nothing is showing this. System can switch to it, gfxCardStatus works fine (no errors shown), the Apple HW test (even the extended one) shows "no problems found", LuxMark allows to select nVidia card for testing, etc. How this would be possible if a significant HW dies? Simply do not understand and out of ideas how to prove it.
Currently Being ModeratedOct 25, 2012 2:42 AM (in response to Magovec)
you got it at this link?
They contain GPU drivers, not only CUDA
Basically on Macs it is better to rely on system-bundled ones - they are just double-checked by nVidia and Apple testers.
IF troubles begin after CUDA install -
I'd recommend you get old drivers (everything with NVDA from system-Library-Extensions) from TM backup (before CUDA) and overwrite new ones, after that repair permissions. Otherwise - you can reinstall them using Pacifist from 10.8 image or (if there are ones) from 10.8.2 combo update. Otherwise - reinstall. Or just wait until Apple or nVidia will roll out update.
Also just to be sure - did you try to repair permissions? And after that - just may be - removing /System/Library/Caches/com.apple.kext.caches/Startup/kernelcache - will lead to kernel cache recreation and may be will heal system.
Currently Being ModeratedOct 25, 2012 3:14 AM (in response to dmdimon)
Yes, from the site http://www.nvidia.com/object/cuda-mac-driver.html. But for a test I downloaded this driver again, installed it again and did not upgrade (this is CUDA 5.0.36 but the latest is 5.0.37). GPU driver is still the same v295.
The troubles did not start after CUDA install. It strated suddenly.
I also tied as per your recommendation to repair permisions. Some of them were repaired including such as System/Library/Frameworks/CoreGraphic.framework. First I said "wow" that must be it! But the tests after shows no progress :-( Still the same.