dual monitor setup on my video card with 2 video ports

[SteVe Cook]

Ubbu 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.
> 
Search the forums for 'dual head', 'xinerama' there's load of info there.


steve