dual monitor setup on my video card with 2 video ports

Christian Benito chbenito at gmail.com
Sun Sep 2 21:05:41 UTC 2007

If you go to the help wiki (help.ubuntu.com) and search for xinerama,
you should find a page that I've used to set up a couple dual head
machines with nvidia cards. The how-to also includes ATI instructions,
but I've never used those.


On 9/2/07, Ubbu <ubunt2 at gmail.com> wrote:
> I received a computer with a video card that looks like it can accept
> 2 monitors. If this is what I think it means, I can and want to have a
> dual-monitor setup.
> Currently, only one (the left one) DVI port works. When I unplug the
> monitor from the left DVI port and plug it into the right DVI port, my
> monitor stays blank/black. Why is this?
>  Is it possible to have a dual monitor setup with my computer, so that
> I could have, in effect, the screen space of the sum of the 2
> monitors? Does this make sense?
> If so, how do i set up my ubuntu to do that?
>  You are probably wondering what video card is in my computer.I did
> lspci, and here are what I think are the pertinent results from lspci:
> 05:00.0 VGA compatible controller: ATI Technologies Inc R480 [Radeon
> X850XT Platinum (PCIE)]
>  05:00.1 Display controller: ATI Technologies Inc R480 [Radeon X850XT
> Platinum (PCIE)] (Secondary)
>  Please note: I am not sure if the description in brackets (i.e.
> "Radeon X850XT Platinum (PCIE") is what the computer found by itself,
> or whether that text was something I typed in manually. I do not
> remember now. So if the text in brackets could be user-edited, it may
> be inaccurate. Just a warning. I guess what I'm trying to say is that
> I'm not sure exactly what video card is in my box. Please explain.
> I don't know why I get "duplicate" information. Is it an error, or is
> that what happens when you have a video card that can accept 2
> monitors. Please explain.
>  My video card has one S-Video port and 2 DVI ports.
> Thank you.
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