[mythtv-users] DVI connection overscan

Raphael rpooser at gmail.com
Sat Apr 14 18:23:09 UTC 2007


Alex Malinovich wrote:
> I have my Myth box hooked up to my TV via a DVI-to-HDMI converter cable.
> The video card feeds DVI out, and the TV takes HDMI in. What's strange,
> however, is that I still get a fair amount of overscan on the TV. I had
> thought that in the case of DVI and newer connections the full signal
> resolution is sent to the TV as part of the signal so no overscan is
> needed.
>
> I've overcome this with Myth by manually scaling the window, but I'd
> prefer to not have to do that and to instead have the full screen
> properly displayed. I had heard that the nvidia-settings utility has
> overscan compensation, but I'm pretty sure that that's only when using a
> TV-out signal, not a direct DVI signal. (If that setting is still there
> with a DVI connection I certainly can't find it, and the interface
> really isn't all that complex.)
>
> So anyone know what's causing the overscanning and how to fix it?
>
>   

I also have a DVI-HDMI cable hooked up to my TV, and at first there was 
an insane amount of overscan. Messing around with the modeline you can 
get rid of some of it. I used xvidtune and found a modeline I liked. It 
still doesn't get rid of overscan completely; it seems that's either 
impossible or just too hard for me to find the magic numbers. The other 
way you could do it is by going into your TV's maintenance menus; some 
have a function to actually change the overscan there. It is the TV's 
and not your computer's fault the overscan is there after all.
However, I wouldn't recommend futzing with the service menus - you can 
"brick" your TV if you do something wrong. I just accept the overscan 
and set the myth UI to take up 100% of the visible screen. Works great, 
since all I ever see on that input is myth anyway.

Raphael


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