[clug] how to set up xorg.conf for DVI overscan

Eyal Lebedinsky eyal at eyal.emu.id.au
Sat Nov 3 02:46:14 GMT 2007

The solution, as I found elsewhere, is to define the scaling to 'nvidia':

Section "Monitor"
	Modeline "720p60" 63.75  1192 1328 1360 1440  672 723 728 741 +hsync -vsync

Section "Screen"
	Option	"FlatPanelProperties" "Scaling = Centered"
	SubSection "Display"
		Modes	"720p60"

This will put my 1192x672 screen in the center of the 1280x720 panel
instead of stretching it to the panel's size.

The 'nv' driver defined the scaling with a different option:
	Option	"FPScale" "no"


Eyal Lebedinsky wrote:
> I asked on the mythtv list and did not yet see an answer. Maybe someone
> here knows the answer.
> Executive summary:
>     How do I configure a xorg.conf mode of an 1152x680 screen encased
>     (letterboxed) in 1280x720 DVI timing? The smaller area must be the
>     advertised viewport size, not a panning area.
>     Note that DVI ignores blanking information so these tricks do not
>     work. Neither does TVOverScan which is only for tv-out.
> LG lied through  their teeth when they said that their HDTV (RT-52SZ8R)
> is native 1280x720 - it trims a significant part of all edges, enough
> to make if difficult to use in text mode. It simply never displays this
> many pixels.
> This cannot be adjusted, not even from the special technician menus.
> I want to tell xorg.conf to send a 1280x720 DVI signal but use a smaller
> area as the drawable. I do not want to just tell the wm to void the edges
> or to set mythtv to run in a window (I know how to do that).
> In effect I want to tell it that my TV over-scans, and it should
> letterbox the screen and present a smaller area to all the applications.
> Using DVI it seems that all the blanking information is simply ignored
> so one cannot play with that, so letterboxing is the only option.

Eyal Lebedinsky	(eyal at eyal.emu.id.au)

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