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Thread: DVI/HDMI output to hdtv requires 4:3 to look right?

  1. #1
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    DVI/HDMI output to hdtv requires 4:3 to look right?

    I am using a DVI to HDMI cable to connect my mythbuntu (7.10) to my HDTV, and it works but...

    1. There is serious overscan for the mythbuntu desktop
    2. When watching TV in Myth, I need to switch to 4:3 to make the aspect ratio look right (16:9 looks squashed)


    Also, what resolution should I use. It defaulted to 800x600 and I changed that to 1024x768, but neither of these are standard hdtv resolutions.

    My video card is a Geforce 7200 and I am using the nvidia prop. drivers.

  2. #2
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    Re: DVI/HDMI output to hdtv requires 4:3 to look right?

    It seems like your tv is not pixelmapping the signal from the myth. I used the nvidiasettings to change the setting in the box Flat Panel settings. In my case under the menu DFP-0. After that the overscan problem was gone.

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    Re: DVI/HDMI output to hdtv requires 4:3 to look right?

    Quote Originally Posted by axelsvag View Post
    It seems like your tv is not pixelmapping the signal from the myth. I used the nvidiasettings to change the setting in the box Flat Panel settings. In my case under the menu DFP-0. After that the overscan problem was gone.

    Sounds good. Where do I find the nvidiasettings?

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    Re: DVI/HDMI output to hdtv requires 4:3 to look right?

    in the mythbuntu control centre. There is a button for it.

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    Re: DVI/HDMI output to hdtv requires 4:3 to look right?

    Quote Originally Posted by superm1 View Post
    in the mythbuntu control centre. There is a button for it.
    Found it.


    Can you tell me how yours is set? Mine does NOT have the "Force full GPU scaling" box ticked, and it is set to "stretch" on the radio buttons.

    When I choose "centred" I get a small screen in the centre of the TV - maybe because I have mythbuntu set to 800x600 right now?

    I forget what the 3rd option is called, but it causes overscanning too.

    I'll also add that the driver is a bit flaky - if I muck around too much with these settings, funny things happen (glitches/corruption in graphics, partial repainting) - that need to be fixed by <ctrl-alt-BS> on the X windows server.

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    Re: DVI/HDMI output to hdtv requires 4:3 to look right?

    Okay so here is the thing.

    When you are talking about a TV, the spec for DVI allows for overscan. DVI on a TV isn't normally used with a computer, but instead a device that will output a picture with overscan.

    You've got three options here.

    1) Switch to VGA, most TVs don't overscan the VGA input. Mine actually will only do its native 1366x768 via VGA.

    2) Create a modeline to work around this.

    3) Resize myth to compensate for overscan. You can define the placement and size of the window in the settings.

    1 is the most ideal route, 2 and 3 will both be time consuming to get right.

  7. #7
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    Re: DVI/HDMI output to hdtv requires 4:3 to look right?

    Quote Originally Posted by superm1 View Post
    Okay so here is the thing.

    When you are talking about a TV, the spec for DVI allows for overscan. DVI on a TV isn't normally used with a computer, but instead a device that will output a picture with overscan.

    You've got three options here.

    1) Switch to VGA, most TVs don't overscan the VGA input. Mine actually will only do its native 1366x768 via VGA.

    2) Create a modeline to work around this.

    3) Resize myth to compensate for overscan. You can define the placement and size of the window in the settings.

    1 is the most ideal route, 2 and 3 will both be time consuming to get right.
    Alright then. I'll try it. Will I lose much picture quality using VGA, as compared to, say, option 2 (if I managed to get it to work)?

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    Re: DVI/HDMI output to hdtv requires 4:3 to look right?

    Quote Originally Posted by ubnewbie2 View Post
    Alright then. I'll try it. Will I lose much picture quality using VGA, as compared to, say, option 2 (if I managed to get it to work)?
    Nothing at all noticable. Personally i'm happier with the VGA over the DVI/HDMI. You can't beat native resolution in my case.

  9. #9
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    Re: DVI/HDMI output to hdtv requires 4:3 to look right?

    Quote Originally Posted by superm1 View Post
    Nothing at all noticable. Personally i'm happier with the VGA over the DVI/HDMI. You can't beat native resolution in my case.
    Right now, I have it working into my VGA at 1024x768, and it looks pretty good. I will experiment with modelines for the 1366x768 native res sometime though.

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    Re: DVI/HDMI output to hdtv requires 4:3 to look right?

    Quote Originally Posted by ubnewbie2 View Post
    Right now, I have it working into my VGA at 1024x768, and it looks pretty good. I will experiment with modelines for the 1366x768 native res sometime though.
    Well if its not already there, add "nvidia-auto-select" to the first of your list in the resolutions line.

    It then tries to sort it out from EDID (and usually does a pretty good job)

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