radeon, screen option

[Csillag Kristof]

Dear Timothy,

Since the 3 monitors are connected to 2 different he GPUs, randr alone
can not solve my problem. Randr only works for monitors connected to a
single GPU: to combine different GPUs into one big desktop, one needs
Xinerama. (Or something like that.) So randr trickery is insufficient here.

Thank you anyway:

       Kristof

ps. The FireMV 2400 also contains two different GPUs, so even if it
worked (which it currently does not), you still couldn't configure more
than two monitors into one big desktop without Xinerama.

Timothy S. Nelson wrote:
> On Fri, 9 Oct 2009, Csillag Kristof wrote:
>
>> Dear all,
>>
>> Now that my individual monitors are operational, I would like to create
>> the following setup:
>>
>>    Monitor 1            Monitor 2            Monitor 3
>>    (Connected to      (Connected to      (Connected to
>>    FireMV 2200)      RS690M)             FireMV2200)
>>
>> If I don't do anything special, the two monitors connected to the same
>> card wind up as one big desktop, and I can put the third monitor RightOf
>> or LeftOf them. But I want to put it between them!
>>
>> How do I do this?
>
>     I have a FireMV 2400, but am only using 2 outputs.  I'm hoping
> that Fedora 12 will make using all 4 outputs possible.  Anyway, here's
> a script that gets run when I start my computer:
>
> ------------------------------------------------------------
>
> # Yes, we set the same things multiple times, but strangely, removing
> # stuff will make this break.
> xrandr --output DVI-0 --mode 1024x768 --crtc 1
> xrandr --output DVI-1 --auto --left-of DVI-0 --mode 800x600 --crtc 0
> xrandr --output DVI-0 --mode 1280x1024
> xrandr --output DVI-0 --mode 1024x768 --crtc 1
> xrandr --output DVI-1 --auto --left-of DVI-0 --mode 800x600 --crtc 0
>
> ------------------------------------------------------------
>
>     My script above does the following:
> 1.    Try to set things the way I want (fails for some reason)
> 2.    Completely change the screen mode of DVI-0
> 3.    Try to set things up the way I want (works this time)
>
>     I'm wondering, if you play with xrandr long enough, will you get
> something useful?
>
>     Say you want monitors 1, 2, and 3 in that order.  I'd be at least
> thinking about ending with a sequence that went something like this:
>
> 1.    Put monitor 3 to the left of monitor 1 (or maybe above)
> 2.    Put monitor 2 to the right of monitor 1 (the right-of slot
> should be
>     free now that monitor 3 isn't in it)
> 3.    *Now* put monitor 3 to the right of monitor 2
>
>     I figure there's a bug in xrandr somewhere since my init script
> has to run some bits twice, but I've worked around it.  Maybe you can
> too.
>
>     HTH :)
>
>
> ---------------------------------------------------------------------
> | Name: Tim Nelson                 | Because the Creator is,        |
> | E-mail: wayland at wayland.id.au    | I am                           |
> ---------------------------------------------------------------------
>
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