Re: Whats te model with Display's and Screens

On 2008-06-11, Ashish Shukla ???? ????? <wahjava@xxxxxxxxx> wrote:
Thanks for the above explanation. I wonder how one can create a new
screen on an existing display. Do I need multi-head display for that ?
If yes, does Xinerama needs to be setup to do that ? Or I can simply do
that with the plug-and-play display feature provided by recent RandR
1.2, as mentioned in the Intel DualHead setup document[1].

In general, when you have multiple screens, you set up your X server to
also have multiple screens. The naming convention is accurate in that
respect :)

For instance, I have two monitors connected to my computer. I'm using
X.org so I've setup xorg.conf to contain two "device" sections (for the
two heads of my graphics board), two "monitor" sections, and two
"screen" sections referencing the above. Then my "serverlayout" section
contains something like:

Section "ServerLayout"
...
Screen 0 "Scr0"
Screen 1 "Scr1" RightOf "Scr0"
...
EndSection

This results in an environment where I may specify by using the DISPLAY
environment variable where to place windows. :0.0 means the monitor to
my left, :0.1 means the monitor to my right. That's two X screens, two
root windows, with their own hierarchy of windows beneath them, and so
on.

I've never used xinerama, but if I'm not mistaken it creates a single X
screen shared by the multiple monitors. So you'd have a single :0.0 and
place windows here and there by simply moving them. I personally don't
like that.

Also I've no idea what RandR does wrt. multiple heads so I can't help
you there.

--
John Tsiombikas (Nuclear / Mindlapse)
http://nuclear.sdf-eu.org/
.

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