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Old 07-19-10, 12:56 PM   #1
mrnick
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Default Refresh rate specified in xorg not applied until nvidia-settings is run

Hello, I have an issues with setting refresh rates.

We have a RHEL5.3 box with a Quadro 4600 running nVidia Driver 195.36.24

One output is connected to an NEC flat panel at 1920x1200 50Hz which is fine.

The other output connects to a DLP projector which we want to run at 1920x1080 @24Hz.

In xorg I specifty a twinview setup and assign the displays as follows:

Code:
Option     "MetaModes" "DFP-0: 1920x1080_24, DFP-1: 1920x1200"
I.e. I am specifically assigning the @24Hz mode to the projector.

When I start X, both screens come up at the requested resolution, but the projector comes up at 50Hz.

If I then run nvidia-settings, suddenly the correct refesh rate is applied and the projector detects 24Hz. I don't have to touch any settings, just starting nvidia-settings is enough.

Anyone any ideas what might be causing this?

I have poked through the X log (verbose mode) and it validates the modes I am trying to set and thinks they are set. xorg file attached.

Cheers
Nick
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File Type: txt xorg.conf.txt (2.5 KB, 100 views)
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Old 07-20-10, 08:09 AM   #2
Licaon
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Default Re: Refresh rate specified in xorg not applied until nvidia-settings is run

run
Code:
nvidia-settings -l
at your DE/WM startup
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Old 07-21-10, 11:14 AM   #3
mrnick
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Default Re: Refresh rate specified in xorg not applied until nvidia-settings is run

Quote:
Originally Posted by Licaon View Post
run
Code:
nvidia-settings -l
at your DE/WM startup
Hi Licaon,

Thanks for the suggestion. I could do this as a work around, but it would be better to find out why it is not selecting the mode in the first place. Surely I should be able to set it all in the xorg?

Any other ideas?

Cheers
Nick
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Old 07-21-10, 03:37 PM   #4
AaronP
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Default Re: Refresh rate specified in xorg not applied until nvidia-settings is run

This is probably the result of the "Force Full GPU Scaling" option, which is enabled by default. You probably have it disabled in your nvidia-settings config file, and loading it with -l makes it turn it off.

You can configure it in xorg.conf with the FlatPanelProperties option. Set "Scaling = Native" for the DFPs in question.
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Old 07-21-10, 04:43 PM   #5
mrnick
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Default Re: Refresh rate specified in xorg not applied until nvidia-settings is run

Aaron, you hit the nail on the head!

I added:

Option "FlatPanelProperties" "DFP-0: Scaling = Native"

And it comes up in 1920_1080_24.

Thanks so much for your help.

Nick
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