[mythtv-users] how to set up xorg.conf for overscan

David Greaves myth at dgreaves.com
Mon Oct 29 15:49:19 UTC 2007


Eyal Lebedinsky wrote:
> Raphael wrote:
>> Eyal Lebedinsky wrote:
>>> No solution yet. I asked on nvnews and hope to get some progress.
>>>
>> Ok. Just to make sure I understand the exact problem: your 1280x768 
>> image is overscanned to the point of only seeing ~1100x680 pixels, and 
>> you're saying that trying a custom modeline has not worked yet?
> 
> No. My 1280x720 image is displayed as is (the TV is specified as native
> 1280x720) on the PC DVI output into the TV HDMI input. The edges are not
> visible. If I set a mode that is not 1280x720 the TV refuses to show it.
> It can, however, scale a HD1080 to HD720, buts does not help me.

2 sugggestions:

Try Xnest/Xephyr? http://www.freedesktop.org/wiki/Software/Xephyr
You would run this without a wm at ~1100x680 and positioned appropriately.
Set the base X to have a black background.
Actually, I just apt-get'ed it and it seeems to work fine :)

Xephyr -screen 1100x680  :1 &
DISPLAY=:1 mythtv &



Second: have you tried xorg people/lists?

I wouldn't be surprised if your problem was widespread enough to be worth
solving and I guess it would be almost trivial at the xorg level.

You basically want X to send a 1280x768 signal but tell the apps that the screen
is only ~1100x680.


For both of these any video would then be app-scaled to that resolution which
may introduce artefacts.

David



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