[mythtv-users] Can anyone recommend a good gfx card with a good tvout? How about geforce4mx?

Edward Wildgoose Edward.Wildgoose at FRMHedge.com
Tue Dec 23 11:38:59 EST 2003


> What I want is to have perfect tvout quality, with no rescaling needed. 
> So ideally have xfree setup to run at > 720x576x24bit.
> Is that possible? On a geforce4mx?

> I tried setting my xfree config to that resolution, but it didnt work. 
> Of course I was trying to display that resolution on my monitor, so that could be the reason that it didnt want to work. 


It does work, and in fact my card Nvidia 5200 can't do 768x576 only 720x576 (when using TV out that is.).  You need to generate a modeline for this though because there are no 50Hz modelines shipped with X (for whatever reason).

I use the following:

    #Videogen
    Modeline "720x576/50p" 27.15 720 736 880 896 576 578 579 606  # 27 MHz, 30.3 kHz, 50.0 Hz
    Modeline "768x576/50p" 29.09 768 792 936 960 576 578 579 606  # 29 MHz, 30.3 kHz, 50.0 Hz

However, if you use the 720x576, be aware that you haven't got a 4:3 aspect display and everything becomes a smaller letterbox in the center.  Solution is to tell X what your monitor aspect ratio is by adding something like:

    DisplaySize 195 146

To your [Monitor] section.  This is measured in mm and you should calculate it to give you a DPI that makes the fonts readable.  In my case I wanted 100DPI which is what the numbers above give.

Perhaps this is suitable for addition to the FAQ?




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