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Old 08-12-07, 06:41 PM   #1
EvilGuru
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Default Flicker When Opening/Closing OpenGL Applications

Hello. I have recently switched from a 7600GT to a 7900GTX card. The problem that I am having is that when I open an OpenGL application I can see the monitor 'flicker' as in it flashes black for an instant. The same occurs around 20 seconds after closing the OpenGL application. In games the flicker can also happen in regions of no activity (such as the loading bar in CS:S under wine).

More interesting is this: I have two identical monitors (ViewSonic VX2025WM) connected by DVI. Yet I only see the flicker on the first screen. I am running the 1.0-9755 drivers (due to the newer ones having trouble with my monitor).

It has been suggested that this is because the driver changes the clock-speeds of the card on the fly when one switches from 2D => 3D mode. My question is how can I disable this feature (the card is whisper quite as it is).

Regards, Freddie.
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Old 08-13-07, 02:23 AM   #2
mooninite
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Default Re: Flicker When Opening/Closing OpenGL Applications

As you noted it is clock speed changes.

You can "disable" it by setting your 2D and 3D speeds the same. Then it will never have to change speeds. :P
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Old 08-13-07, 05:23 AM   #3
EvilGuru
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Default Re: Flicker When Opening/Closing OpenGL Applications

Quote:
Originally Posted by mooninite
As you noted it is clock speed changes.

You can "disable" it by setting your 2D and 3D speeds the same. Then it will never have to change speeds. :P
Where is the option to change the clock-speeds? As I can not seem to find it in the settings application.

Regards, Freddie.
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Old 08-13-07, 12:32 PM   #4
mooninite
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Default Re: Flicker When Opening/Closing OpenGL Applications

Quote:
Originally Posted by EvilGuru
Where is the option to change the clock-speeds? As I can not seem to find it in the settings application.

Regards, Freddie.
You will need to read the README file from the nVidia driver and look for the "Coolbits" option. The overclocking menu is hidden by default.
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Old 08-13-07, 03:48 PM   #5
ThermalGrease
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Default Re: Flicker When Opening/Closing OpenGL Applications

huhu

I to have this problem (not a major one but...), funny thing, if I start the app (tc:elite for an example) from a console, no flickering
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Old 10-09-07, 02:54 AM   #6
mekboy
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Default Re: Flicker When Opening/Closing OpenGL Applications

Same problem here. If i start an OpenGL app from a console i get no flickering. When i open the same app from KDE the scren flickers. If i use Beryl and initialize anything OpenGL it flickers. Disabling SLI removes the flickering as well.

Any ideas how to use SLI and not get a flickering screen?
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Old 10-10-07, 01:31 AM   #7
mekboy
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Default Re: Flicker When Opening/Closing OpenGL Applications

See the attached bug report.
Attached Files
File Type: zip nvidia-bug-report.log.zip (35.7 KB, 99 views)
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Old 10-24-07, 08:42 AM   #8
drake55
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Default Re: Flicker When Opening/Closing OpenGL Applications

Exactly the same problem , I can't play because my mouse sensitivity is always different becoz of that problem
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