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Don F 2004-12-10 10:38
I have a GeForce 6800 GT with an LCD attached to the DVI output, and a CRT attached to the VGA output. I set the LCD to be the primary display and the CRT to be secondary. When viewing videos (DVD, AVI, REAL, etc) they play on the LCD perfectly as long as the secondary (CRT) monitor is enabled. If I disable the secondary display, all video playback on the LCD becomes choppy, almost like it is playing at about 10 frames per second. If I reenable the secondary, the video performance returns to normal. Is there anyway that I can disable the secondary display without loosing my video playback capabilities?
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Christian Studer 2004-12-11 01:17
Sounds like DirectX acceleration gets disabled when you disable the secondary monitor, you can check this by running dxdiag.exe.
Most likely an issue with the display driver, I would recommend installing the latest drivers from Nvidia.
Christian Studer - www.realtimesoft.com
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Don F 2004-12-11 02:40
I ran dxdiag.exe and everything is enabled. I also installed the latest Nvidia driver and it still doesn't work. As far as Direct X being disabled, I am able to play Direct X based games without any problem. It is only video files. Very odd.
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Bigryan 2005-01-02 05:37
I have almost the same problem and I was woundering if you have resolved it yet. I also have a 6800 GT and older games such as unreal tournament are very choppy on the DVI head but play perfectly on the VGA side. Its only Older games though. Why would older games be choppy at all on a 6800 GT? I have newest driver and Dx 9.0c. I have the same problem on another computer where Older games are choppy if I use the Primary VGA(5700 Ultra). I have to use the DVI to VGA adapter and use the DVI head as primary as this system is only a Single monitor system. This has always been a problem with Nvidia Dual head cards. I had the same problem with a PNY Verto GeForce FX 5200 dual VGA, the promary VGA was very choppy in Unreal Tournament and BF1942.
AMD Athlon XP 3200+
Evga 6800 GT
1024MB Kingston pc3200
Antec True 430W
MyComputer
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