Hi Steve
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Originally Posted by Steve
My mythbox currently has a "rivafb: nVidia device/chipset 10DE0150
rivafb: nVidia Corporation NV15 [GeForce2 GTS/Pro]" fitted. This has got a composite out on it, so is this likely to support interlaced modes?
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It's the graphics processor and driver which determine whether interlaced modes are supported, my GeForce2 card with the nVidia 1.0-6629 driver release did not support interlaced modes; the same driver with a GeForce4 card does.
So it's likely that your card doesn't support interlaced modes - if you're using it in a MythTV box on 625 line you probably have 288 line progressive at present.
Have a look through the X log file (probably /var/log/Xorg.0.log or /var/log/XFree86.0.log.) This should contain information on whether the GPU supports interlacing, the range of the dot-clock generator, etc., along with some information on the calculated timings for whatever display modes you're using.
The card won't produce non-standard modes out of the composite or S-Video outputs; as John says this comes via a TV encoder chip which handles 625/50 PAL and 525/60 NTSC. The nVidia driver refuses to run anything other than 'standard' resolutions/timings on either S-Video out or composite out anyway; X will exit with an error if you try. This is why I'm doing this via the RGB+sync output; if it worked via S-Video or composite I'd be using it as it'd be less complicated and saves some effort
Regards, Kat