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Old 04-21-06, 03:33 PM   #1
nagini
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Join Date: May 2004
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Default 8756 G-Sync No Longer Works!

Hi

I am posting here because no one from nvidia ever seems to look in the workstation area - sorry.

I have three machines with FX4500 cards connected to G-Sync boards. After installing the 8756 driver and setting things up again our OpenGL apps stopped synchronizing. The nvidia-settings setup works fine (as before) and it shows that the machines are sync'd. However when we run any application that uses the GLX_NV_swap_group extensions to activate things the join functions fail! The query function shows 1 swap group and 1 swap barrier. But the attempt to join fails.

HELP nVidia! Guess we will have to downgrade...
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Old 04-21-06, 04:10 PM   #2
netllama
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Default Re: 8756 G-Sync No Longer Works!

Specifically which applications are you using?

Please generate and provide an nvidia-bug-report.log.

Thanks,
Lonni
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Old 04-21-06, 04:27 PM   #3
nagini
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Default Re: 8756 G-Sync No Longer Works!

First, I can confirm that downgrading the driver to 8178 works as expected.

I have attached a zip file with two little test programs that illustrate what we are doing. glxb.C works without actually opening a window but tries to join the swap group and barrier using glx. The second program glxbarrier.C is started on the slaves as 'glxbarrier s' first. 'glxbarrier m f' is started on the master.

Will follow up with a debug report shortly.
Attached Files
File Type: zip glxbarrier.zip (5.9 KB, 123 views)
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Old 04-21-06, 05:12 PM   #4
netllama
NVIDIA Corporation
 
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Default Re: 8756 G-Sync No Longer Works!

I've reproduced this problem, and opened bug 224540.

Thanks,
Lonni
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Old 04-21-06, 05:39 PM   #5
nagini
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Default Re: 8756 G-Sync No Longer Works!

Well, that was quick. Here are log files from the master machine using both version of the driver for comparison.

Scott
Attached Files
File Type: zip nvidia-bug-log.zip (50.9 KB, 122 views)
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Old 04-21-06, 05:43 PM   #6
nagini
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Default Re: 8756 G-Sync No Longer Works!

What is the possibility of this getting fixed in the near term?

It kind of makes a G-Sync setup problematic as we were looking to take advantage of some of the 8756 features.

Thanks,
Scott
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