[mythtv-users] MX440/Radeon wars (Was: Hardware ideas)

[Jarod Wilson]

On Friday 25 June 2004 23:34, Hamish Moffatt wrote:
> On Fri, Jun 25, 2004 at 10:25:27AM -0700, Jarod Wilson wrote:
> > On Friday 25 June 2004 06:20, Clyde Stubbs wrote:
> > > Can you provide an example
> > > of how you've done this?
> >
> > Its been on my web site for ages now, used by quite a few people:
> > http://wilsonet.com/mythtv/XF86Config-SVid.txt
> >
> > > I'm more than happy to test your
> > > claims if you can be a little more specific.
> >
> > I don't have a PAL-specific config on hand, but change the HorizSync and
> > VertRefresh values to match PAL and change the TVStandard to
> > PAL-whichever, and you should be in business.
>
> So set VertRefresh to 50-50, as you set 60-60 in your example?

I believe that is correct.

> What's the effect of running a refresh rate in X that doesn't match the
> TV rate?

Bad things. If you even get a picture, you'll likely see rolling artifacts, 
horrible jitter, etc., since the refresh rates are out of sync.

> Does the card really output the specified refresh rate, or is 
> it always 50 Hz out for PAL, for example?

I believe it outputs the specified refresh rate. Why simply saying "PAL" 
doesn't override that, I dunno. Maximum flexibility, I suppose...

> To be honest I can't tell what I'm getting out of X. I have defined a
> 800x600x50 mode, but I'm not using it yet. The X log tells me what valid
> modes exist:
>
> (**) NVIDIA(0): Validated modes for display device TV-0:
> (**) NVIDIA(0):      Default mode "800x600": 50.0 MHz, 48.1 kHz, 72.2 Hz
> (**) NVIDIA(0):      Default mode "640x480": 25.2 MHz, 31.5 kHz, 60.0 Hz
> (**) NVIDIA(0):      Mode "800x600x50": 33.2 MHz, 31.4 kHz, 50.0 Hz
> (**) NVIDIA(0):      Default mode "800x600": 40.0 MHz, 37.9 kHz, 60.3 Hz
> (**) NVIDIA(0):      Default mode "800x600": 36.0 MHz, 35.2 kHz, 56.2 Hz
> (**) NVIDIA(0):      Default mode "400x300": 25.0 MHz, 48.1 kHz, 72.2 Hz
> (D) (**) NVIDIA(0):      Default mode "400x300": 20.0 MHz, 37.9 kHz, 60.3
> Hz (D) (**) NVIDIA(0):      Default mode "400x300": 18.0 MHz, 35.2 kHz,
> 56.3 Hz (D) (**) NVIDIA(0):      Default mode "320x240": 12.6 MHz, 31.5
> kHz, 60.1 Hz (D)
>
> but doesn't say which one it is actually using, only:
>
> (II) NVIDIA(0): Setting mode "800x600"
>
> which could be any of 3 different refresh rates.

Yeah, I dunno on that one...

> Is the correct refresh rate (ie 50 Hz for me, 60 for you) required for
> "experimental A/V sync" to work and be useful?\

I believe so. It stands to reason that for optimal sync, the output refresh 
rate ought to be in sync with the refresh rate the TV wants.

-- 
Jarod C. Wilson, RHCE
jcw at wilsonet.com

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