thanks for replying, though i am not sure wether i understand...
what you write would mean i use xinerama (one big virtual screen)...
but the device configuration options offered by nvidia-settings are:

1. Disabled,
2. Separate X screen (requires X restart),
3. Twinscreen (this is what I choose for working in cinelerra).

any dualhead option does not seem available,
maybe you have an ati card? with different terminology?
or how else do you configure your setup? directly in xorg.conf?

cheers
georg


On Monday, 14. April 2008 10:42:29 Christian Thaeter wrote:
> Kurt Georg Hooss wrote:
> > well... i CAN move windows between the screens,
> >  even have windows half on one screen and half on the other
> >  (wich may be useful in some rare cases).
> >
> > i use nvidia settings, configure the second monitor to "twinscreen".
> > graphics card: MSI GeForce 6600, 256 MB, two QXGA monitors (2048x1536).
> > so i wonder why it should not work in christians setup...
>
> because there is a difference between xinerama and dualhead:
>  * xinerama accumulates 2 or more monitors as one big screen
>    (simplified, the concept has some quirks)
>  * dualhead makes 2 or more monitors independent screens.
>
> Generally I like dualhead setups more, but that is matter of personal
> preference, and what software one wants to use. Some programs and
> windowmanagers are notoriously known for breaking on xinerama.
>
> It also depends somewhat on the hardware you have, some (lower) end
> graphics boards can use xv or opengl only on one screen or xinerama
> screens give a big performance bottleneck because of the high res.
>
> > sure this this chain of devices may seem a bit cumbersome.
> > also, as soon as the framerate drops below 25fps, the picture looks
> > buggy. so the material must be rendered before this method makes sense.
> >
> > actually i think a professional pipeline needs a for reference tv screen.
> > however the graphics card supports only two devices at a time.
> > and i never had the time to test with a second card.
>
> Some allow a third device and route that out on a S-Video socket, that
> was my intention, use that for a reference TV compatible signal, I just
> didn't played to figure out a suitable pal-compatible modeline yet.
>
>       Christian
>
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-- 
dr. kurt georg hooss
kurts film / schoepfung & wandel
breite strasse 6-8, d-23617 luebeck
kurts-film.de

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