[mythtv-users] Modeline adjustments?

[Tim Scholl]

Cory,

Thanks for the suggestions I'll give them a try and let you know!

Tim

On 8/8/06, Cory Papenfuss <papenfuss at me.vt.edu> wrote:
>
> On Mon, 7 Aug 2006, Tim Scholl wrote:
>
> > The final frontier!  Have Myth running great I am now trying to
> transition
> > to the HDTV display!
> >
> > I found a standard modeline of 1080i and put it into my XF86Config-4
> config.
> > ----------------
> > HorizSync 31.5 - 37.9
> > VertRefresh 59 - 61
> >
> > ModeLine "ATSC-1080-60i" 74.25 1920 1960 2016 2200 1080 1082 1088 1125
> > Interlace
> > ---------------
> >
> > I startup mythtv and the dispay looks good on my
> monitor!!  sooooooooo...
> > I attached the vga output to an Audio Authority A960 transcoder, turned
> on
> > my HDTV, and got WALLA!!   A fantastic picture,  great color, stable, no
> > jitter and looks great.
> >
> > Only one problem!!
> >
> > The left hand side of what should be the normal display,  is in the
> middle
> > of the screen!!   Then rest of the display drops off at the end of the
> > screen and wraps around to the other side and joins again in the middle.
> > The full display is visable and clear as a bell!
> >
>
>         You could try adjusting it to something more like this:
> ModeLine "ATSC-1080-60i" 74.25 1920 2060 2116 2200 1080 1082 1088 1125
>
>         I added 100 dots of black on the right hand side and removed 100
> dots of black on the left-hand side (i.e. changed 1960->2060 and
> 2016->2116).  That should move the screen, but it won't move it anywhere
> close to half a screen width.
>
> > Since it looks good on the monitor, why is it so far off when displayed
> on
> > the HDTV?
> > Not being a that familer with modelines, is this a modeline issue or do
> I
> > need to look elsewhere?
> >
> > Does anyone know what needs to be adjusted to get it to shifted to the
> left
> > hand side?
> >
>         You might try different combinations of [+-]hsync and [+-]vsync at
> the end of the modeline:
> ModeLine "ATSC-1080-60i" 74.25 1920 1960 2016 2200 1080 1082 1088 1125
> +hysnc -vsync interlace
>
>
>         It definately sounds like the HDTV has having trouble finding the
> sync pulse.  Strictly speaking, HD-component requires bi-directional sync
> signals, and that's a much harder thing to generate (correctly) from RGBHV
> like VGA.  I don't know if the A960 does that, or makes the easier
> uni-directional sync.  Any jumpers to twiddle on the transcoder?
>
> -Cory
>
> --
>
> *************************************************************************
> * Cory Papenfuss, Ph.D., PPSEL-IA                                       *
> * Electrical Engineering                                                *
> * Virginia Polytechnic Institute and State University                   *
> *************************************************************************
>
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-- 
Tim Scholl
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