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Old 01-15-03, 05:14 PM   #1
koef
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Join Date: Jan 2003
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Default TNT2 interlaced modes

I am trying to implement a high quality TV out function by connecting the VGA output of a Riva TNT2 M64 PCI board to the RGB inputs of my television. A small circuit (http://www.sput.nl/hardware/tv-x.html) creates the necessary composite sync signal from the VGA connector's H and V sync signals. A modeline like "736x575i" 14.16 736 760 824 904 575 580 585 625 interlace -hsync -vsync will produce a signal that the TV can sync on.

Using the stock XFree 4.2.1 "nv" driver, I get a clean picture on my TV. However, this driver does not support the XVideo extension on TNT2 chips, so playing movies full screen is sluggish.

Using the Nvidia 1.0.4191 driver, xvinfo shows that XVideo is working. But my TV is unable to synchronize on the signal. An oscilloscope connected to the sync pins on the VGA connector shows that the timings are way off the needed values for a TV.

Is interlaced mode or low dotclock support in the nvidia driver broken?
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Old 02-19-03, 04:25 AM   #2
romsoft
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Location: Romania-Bucharest
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Default

Interlace mode does not work, even if X server report that works. The vertical refresh is 25Hz not 50Hz; it's like the same modeline without 'interlace'. Tryed with 3123 and 4191 drivers on SuSE 7.3 . Must report to NVidia.
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