[clug] how to set up xorg.conf for DVI overscan
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':
Modeline "720p60" 63.75 1192 1328 1360 1440 672 723 728 741 +hsync -vsync
Option "FlatPanelProperties" "Scaling = Centered"
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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