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Old 09-05-06, 10:30 AM   #1
dual_boot
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Default Dual 4500 Cards - Stereo Sync Issue

I am running a Sun Ultra 40 (Fedora Core 4) with 2 Quadro FX 4500 cards (Driver 8762). We are attempting to drive a CAVE with one PC. Everything seems ok, except the stereo sync. We are using the active stereo option in the xorg.conf file (I have attached our current config file). The stereo looks fine on the card with the sync cable attached, but on the second card we get a big blue bar – what I refer to as a “hum bar”. So, it definitely looks like the second card is not picking up the sync from the first. In the NVidia docs, it says active stereo will work in twin view IF all meta modes are identical (which I believe they are).

Is there something that I am missing?
Attached Files
File Type: txt xorg.conf.1280x1024.cave.txt (3.2 KB, 114 views)

Last edited by dual_boot; 09-05-06 at 10:57 AM.
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Old 09-05-06, 10:48 AM   #2
netllama
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Default Re: Dual 4500 Cards - Stereo Sync Issue

This sounds like you're just not in sync across all displays. Please generate and post an nvidia-bug-report.log while this problem is present.
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Old 09-05-06, 11:18 AM   #3
dual_boot
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Default Re: Dual 4500 Cards - Stereo Sync Issue

here is the log...(the forum would not let me attache because it was more than 100k)

http://www.sacreativeservices.com/nvidia-bug-report.log
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Old 09-05-06, 11:23 AM   #4
netllama
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Default Re: Dual 4500 Cards - Stereo Sync Issue

According to the bug report, you're requesting a generic 1280x1024 mode, with two different CRTs. This virtually ensures that you are not receiving the same mode on both of them. You need to generate a modeline for 1280x1024, and request that modeline to ensure that you are actually getting the same mode on both displays.

I'd also suggest removing the ConnectedMonitor & Coolbits options, as they will likely only confuse things further. Testing with 1.0-8774 would also be recommended.

Thanks,
Lonni
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Old 09-05-06, 11:43 AM   #5
dual_boot
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Default Re: Dual 4500 Cards - Stereo Sync Issue

Sounds good... I will try a specific modeline and see if that makes a difference.

When I remove "ConnectedMonitor" option, I no longer get output from all 4 outputs. Just the first output from each card?

Thanks for the quick response.
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