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From: Frank H. Baker on 4 Apr 2010 17:30
My setup is much like yours, though I have two nVidia 8400GS boards,
running the console off one and the other two monitors off the other, a
VGA driving one monitor and a DVI the other, and I installed the nVidia
driver. Though I have been aware of TwinView, the "twin" made me think
it was adapted primarily for two monitors, and I have not looked further
into it. Where does TwinView fit into the processing path?

Regards and thanks for following up on this,
Frank

> top/bottom layout (one display is on the top of the other).
>
> I use nvidia card with dual DVI-D ouput and a I have chosen a "separate
> display" layout, so in one display (the bottom one) I get the full
> desktop icons and bottom bar but the display on top is just clean (no
> bars neither icons, just the background).
>
> I am using nvidia propietary driver which allows to select that "mode"
> under /etc/xorg.conf named "twinview". So I guess you will have to dig a
> bit about your card (and driver) capabilities and specify the desired
> mode in your xorg.conf file.
>
> What VGA(s) do you have in that machine and what driver is being used?
>


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From: Camaleón on 4 Apr 2010 18:10
On Sun, 04 Apr 2010 16:20:34 -0400, Frank H. Baker wrote:

> My setup is much like yours, though I have two nVidia 8400GS boards,
> running the console off one and the other two monitors off the other, a
> VGA driving one monitor and a DVI the other, and I installed the nVidia
> driver. Though I have been aware of TwinView, the "twin" made me think
> it was adapted primarily for two monitors, and I have not looked further
> into it. Where does TwinView fit into the processing path?

Are the boards linked by SLI (just as one card) or they acting
independently (as two different boards)?

Anyway, I put here the relevant sections of my "/etc/X11/xorg.conf" file
(btw, I am running Debian lenny and one Nvidia 7600GS, dual dvi-d ports).
You can test it to see how it looks in your system and if you like what
you see you will just have to add a second stanza for the other card.

(before making any change in your current "xorg.conf" file, do a backup
copy of the original one for a quick restoration)


***
Section "Device"
Identifier "Configured Video Device"
Driver "nvidia"
EndSection

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Option "RenderAccel" "true"
Option "TwinView"
Option "MetaModes" "1680x1050 1280x1024"
Option "TwinViewOrientation" "Above"
***


Some notes:

- 1680x1050 is the 21" monitor located on top (this one has an empty desktop)

- 1280x1024 is the 19" monitor located at the bottom (the one holding
desktop icons and task bar)

- "TwinViewOrientation" "Above" indicates a top/bottom layout. You will
have to modify this value at your conevience, i.e., "RightOf" or "LeftOf"

Whith this setup, only display "1" and "2" will be detected and configured.

If that works as expected, then you could do the same with the third
monitor. I guess you will have to choose "Device0" and "Device1" to
identify both nvidia cards, but I'm not sure with this point...

More info about "twinview" is available at nvidia "readme":

http://us.download.nvidia.com/XFree86/Linux-x86_64/195.36.15/README/README.txt

> Regards and thanks for following up on this, Frank

You're welcome. THT.

Greetings,

--
Camaleón


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