[mythtv-users] Migrating from VGA to HDMI

Matt Doran matt.doran at papercut.biz
Tue Apr 24 10:52:44 UTC 2007



Phill Edwards wrote:
>> You do get overscan using the 1280x720_60 built-in X modeline ... but
>> the output is pretty good.  But it's hard to tell the difference between
>> VGA (at the native res) and HDMI at less than native.    I've also
>> experimented with the 50Hz modeline, which should be better to display a
>> 50HZ signal (I assume you're in Aus?).  I honestly had trouble noticing
>> the difference.
>>
>> I also found a mode-line that has no overscan (it's a weird resolution
>> though).  I don't have access to it from here, but can post it if you're
>> interested.
>>     
>
> Yes please - definitely intrerested. And yes, I'n in Australia.
>
>
>   
This one gives you no overscan, through HDMI:

    Modeline "1216x684" 74.16 1216 1356 1396 1648 684 707 712 750 +hsync
    +vsync


The standard X 720p modelines 1280x720_50 and 1280x720_60 can be used 
over HDMI.

This gives you native resolution, but only works over VGA.

    Modeline "1368x768" 85.478 1368 1424 1536 1792 768 771 777 795
    +hsync +vsync



You'll need to use these in the "Device" section to get some of these 
modes to work:

    Option "ExactModeTimingsDVI" "1"
    Option "ModeValidation" "AllowNon60HzDFPModes"

Good luck with it,
Matt
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