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Old 02-26-09, 05:24 PM   #1
peastman
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Join Date: Feb 2009
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Default Nvidia drivers with KVM

I just got a new computer with a GTX280, which I'll be using for CUDA programming. It's running Fedora 9.

Everything was working fine until I installed the Nvidia drivers. After doing that, I now get a blank screen. The problem appears to be related to my KVM. If I hook up the monitor directly, it works fine. Going through the KVM, though, my screen is blank. Switching back to the "nv" driver that came with the OS makes it work again, but of course then I can't use CUDA.

I've found lots of messages around the internet by people with similar problems, and they suggest various changes to xorg.conf, such as

Option "ConnectedMonitor" "DFP"

and

Option "UseEDID" "FALSE"

I've tried these, but none of them help. Only switching the Driver option to "nv" instead of "nvidia" gets it working. I'm about out of ideas, and my new computer is currently functioning as a very expensive paperweight. Any help would be very much appreciated!

Peter
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Old 02-26-09, 06:06 PM   #2
JaXXoN
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Default Re: Nvidia drivers with KVM

Pure speculation: the "nvidia" driver runs the I2C bus of the DDC interface
at a higher speed than the "nv" driver and the KVM can't scope with it.
I don't think the bus clock is user adjustable.

You may try the following:

1. Attach the display directly (without KVM and make sure it works), start
"nvidia-settings", then "Aquire" the EDID of the display, save the resulting
"edid.bin" and copy it to /etc/X11/.

2. Add

Code:
Option "CustomEDID" "DFP-0:/etc/X11/edid.bin"
to the Screen section of your xorg.conf and try with the KVM.
(it may be necessary to do "DFP-1" instead of "DFP-0" depending
on your setup and VGA BIOS).

maybe that helps

regards

Bernhard
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Old 02-26-09, 06:57 PM   #3
peastman
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Default Re: Nvidia drivers with KVM

That fixed it! Thank you so much. I doubt I would ever have figured that out on my own. I bow down before you in gratitude!

Peter
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Old 02-26-09, 07:11 PM   #4
JaXXoN
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Default Re: Nvidia drivers with KVM

Nice to hear that this trick did it for you! Thanks for the feedback.

regards

Bernhard
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