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Driver issue when trying to use CUDA with Vegas
I’m posting here on the off chance that someone else has seen this problem.
I’ve been using the 182.50 driver for my nVidia GTX 260 card for years, because anything later than that has a strange problem that causes the driver to put my monitor into analog mode after Windows starts. (When the system boots, the monitor has a digital signal until Windows gets to the login screen.) Now I want to use CUDA to speed up rendering in Vegas, but I need a much more recent driver than 182.50 to do that. And yet I don’t want to use a blurry monitor, so unless I can figure out why the driver puts the monitor in analog mode after Windows starts, I’m stuck.
I did install the latest 296.10 driver, and rendering is 2.5 times faster when CUDA is available. But the monitor is blurry in analog, so I gave up.
Has anyone here had a similar problem, and if so, is there a solution? I’ve heard talk of special registry entries that force the driver to stay in digital output all the time.
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3 Replies
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Anthony, to be clear, you are attaching the monitor as a DVI or similar digital feed, but your current drivers change it into an analog signal when Windows boots? Are you on Windows 7? I would assume that your monitor is fully capable of handling the digital signal. Is it able to be booted on other hardware in digital? (i.e. can you hook up a laptop to it in digital and does it work properly?)
If your monitor is digital, and the signal is digital, why would you want to run it in analog mode? Maybe I’m not understanding something here. My monitor is digital and the resolution is always the same from start to finish, once the drivers load. Obviously, if I boot into Windows in recovery mode, and the computer doesn’t load the drivers, it uses a generic driver set to run Windows, which would give a low res analog like view.
So what version of Windows?
What is your actual hook up? DVI? HDMI? etc.
What is the make/model of the monitor?thx
Al
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Hi,
it might be worth trying the digital output with a recent driver and with Windows set to a low resolution (e.g. 1024×768) and a low frequency. Maybe your monitor has an issue with some modes if they are managed differently by the new drivers, than by the older one??
If this works, then you could try different settings to improve the resolution and the frequency step by step from within Windows, which would fall back to the initial settings after 10-15 seconds if it does not work.
My 2 cents,
Frederic—
FBmn Software: Professional GPU-powered plug-ins to fix White Balance and Exposure issues in a few clics.
Color-matching made easy with the ColorMatch plug-in.Want to learn on Sony Vegas Event Pan/Crop tool? Watch my tutorial.
Or about Keyframes? Watch this one. French version here. -
Well, I found the fix. There are some pages on the Web that talk about a “DevicesConnected” registry parameter for the nVidia drivers. I added this parameter after installing the 296.10 driver, and it works … that is, with this parameter in place, you can force the video card to output digital to your monitor(s), which allows you to use CUDA for Vegas without sacrificing the digital output to your monitor(s).
So, in summary, this is the important thing: If you update your nVidia driver in order to benefit from CUDA for faster rendering in Vegas, and your monitor suddenly starts working in analog mode rather than digital mode after installing the newer driver, add the following binary value to your registry after installing the driver, and reboot:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlVideoxxxxx�000DevicesConnected
where xxxxx is a long string that will vary from machine to machine (look for the folder that has hundreds of parameters in the 0000 folder). Set the value to binary and use a value of 00 00 03 00, which will force both monitors to digital.
You can google for this for more details.
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