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Old 09-13-06, 01:22 PM   #13
inlikeFlynn
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Default Re: 7950GX2 Linux support

Hello, I am doing some experimentation with two 7950GX2 cards, driver version 8774, Fedora Core 5, and ideally would like to devote each of the 4 gpus to their own screen or DVI output (No SLI).

It seems that only one GPU is being used per card for DVI output.

The PCI addresses assigned by the motherboard / OS are 3.0.0, 4.0.0, 14.0.0, and 15.0.0 with 3.0.0 and 4.0.0 on one card and 14.0.0 and 15.0.0 on the second card.

PCI 4.0.0 is recognized by the NVIDIA driver as the main gpu on the first card and has the two DVI ports assigned to it. With the second card the main is PCI 15.0.0.

The second gpu on each card does not seem to have any DVI ports assigned to it, which makes sense as there are only two DVI ports on each card.

Internally, the driver does assign a screen and device to the second gpu and the X log indicates that there is output to that screen on the second gpu. Unfortunately since there is not a physical DVI port for the second gpu to use, we see no output to the monitor from that second gpu.

Physically it may not be possible. Is there any way through gpu programming to utilize and devote each gpu to a screen or DVI port?

Thanks
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Old 09-13-06, 01:33 PM   #14
netllama
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Default Re: 7950GX2 Linux support

Have you tried:
nvidia-xconfig -a --separate-x-screens --xinerama

If that fails to help, please generate and post an nvidia-bug-report.log.

Thanks,
Lonni
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Old 09-13-06, 03:24 PM   #15
inlikeFlynn
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Default Re: 7950GX2 Linux support

Thanks for responding.

I am not having any problem bringing up 4 screens but only the main gpu on each card will provide output.

nvidia-xconfig -a --separate-x-screens will configure 8 different device and screen sections. Of course there are only four DVI outputs so it seems only the main gpus will power those.

The driver can successfully configure a separate screen for each gpu but the secondary gpus have no DVI ports to send a signal to.

I was thinking that there may be some way to isolate and tie each gpu to its own DVI output port, perhaps via gpu programming.

Thanks.
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Old 09-13-06, 03:29 PM   #16
netllama
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Default Re: 7950GX2 Linux support

Please generate and post an nvidia-bug-report.log.
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Old 09-14-06, 12:04 PM   #17
inlikeFlynn
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Default Re: 7950GX2 Linux support

Hello, here is the nvidia-bug-report log.
Thanks.

Here is the .zip version.
Attached Files
File Type: zip nvidia-bug-report.zip (41.6 KB, 132 views)

Last edited by inlikeFlynn; 09-14-06 at 12:11 PM. Reason: Log file to large.
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Old 09-14-06, 12:07 PM   #18
netllama
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Default Re: 7950GX2 Linux support

I don't see anything attached here.
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Old 09-14-06, 03:12 PM   #19
inlikeFlynn
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Default Re: 7950GX2 Linux support

My first log was in excess of the allowed size limit so I have now attached a .zip file.

Thanks
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Old 09-14-06, 03:34 PM   #20
netllama
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Default Re: 7950GX2 Linux support

Now that I see a bug report, I understand what you're trying to accomplish. The 7950GX2 is really targetted for SLI, so there isn't an expectation that anyone would want an X screen/display device for each GPU. You need the Quadro 4500X2 to accomplish what you're describing:
http://www.nvidia.com/object/quadro_fx_4500_x2.html
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Old 09-14-06, 04:04 PM   #21
inlikeFlynn
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Default Re: 7950GX2 Linux support

Thank you, I'll look into the Quadro card. I sure appreciate the great support.

Thanks again.
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Old 09-14-06, 04:21 PM   #22
inlikeFlynn
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Default Re: 7950GX2 Linux support

One more thing, other than the physical size, would you forsee any trouble running two of the Quadro FX 4500 X2 cards, in regards to driver issues?

Thanks
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Old 09-14-06, 04:29 PM   #23
netllama
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Default Re: 7950GX2 Linux support

In a 64bit environment, I don't expect any problems.

-Lonni
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Old 09-14-06, 04:36 PM   #24
zander
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Default Re: 7950GX2 Linux support

For clarification: the NVIDIA Linux graphics drivers themselves should also work fine with these GPUs on 32-bit Linux systems, but there's a possibility that they'd be impaired by kernel virtual memory exhaustion problems. Depending on the Linux kernel version used, such problems are more or less easily solved (or worked around). This will be described in greater detail in future versions of the NVIDIA README.
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