Triple monitor, one card; xrandr => xorg.conf

[Alex Deucher]

On Sat, May 25, 2013 at 9:00 AM, Nick Urbanik <nicku at nicku.org> wrote:
> Dear Folks,
>
> It is trivially easy to set up three monitors with an ATI 5450 video
> card.  One is plugged into the VGA, the other into the DVI, and the
> last into the DisplayPort connector.
>
> Now I want the display port monitor in the middle, as it is the most
> fabulous.
>
> This is easy with xrandr:
> xrandr --output DVI-0 --mode 1920x1200 --output DisplayPort-0 --mode
> 1920x1200 --right-of DVI-0 --output VGA-0 --mode 1600x1200 --right-of
> DisplayPort-0
>
> which works like a charm.
>
> Now trying to write that as xorg.conf.  Miserable failure.  And Gnome
> 3 is unable to start.
>
> So here is the xorg.conf I have tried so far:
>
> Section "Device"
>   Identifier "ati-5450"
>   Option "Monitor-DVI-0" "left"
>   Option "Monitor-DisplayPort-0" "middle"
>   Option "Monitor-VGA-0" "right"

You can skip the above lines if you just change the monitor
identifiers to match your output names.  Also, I'm not sure that
having relative locations for every monitor will work correctly.  For
the farthest left one, leave out the orientation.

> EndSection

Try something like this:


Section "Device"
  Identifier "ati-5450"
EndSection

Section "Monitor"
   Identifier "DVI-0"
EndSection

Section "Monitor"
   Identifier "DisplayPort-0"
   Option "RightOf" "DVI-0"
EndSection

Section "Monitor"
   Identifier "VGA-0"
   Option "RightOf" "DisplayPort-0"
EndSection

>
> Section "Monitor"
>   Identifier "left"
> EndSection
>
> Section "Monitor"
>   Identifier "middle"
>   Option "RightOf" "left"
> EndSection
>
> Section "Monitor"
>   Identifier "right"
>   Option "RightOf" "middle"
> EndSection
>
> and here is the output of xrandr:
> $ xrandr
> Screen 0: minimum 320 x 200, current 5440 x 1200, maximum 8192 x 8192
> DisplayPort-0 connected 1920x1200+1920+0 (normal left inverted right x axis
> y axis) 518mm x 324mm
>    1920x1200      60.0*+
>    1920x1080      60.0     1600x1200      60.0     1680x1050      60.0
> 1280x1024      60.0     1280x960       60.0     1024x768       60.0
> 800x600        60.3     640x480        60.0     720x400        70.1  DVI-0
> connected 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x
> 324mm
>    1920x1200      60.0*+
>    1920x1080      50.0     60.0     1600x1200      60.0     1680x1050
> 59.9     1280x1024      60.0     1440x900       59.9     1280x960       60.0
> 1280x800       59.9     1280x720       50.0     60.0     1024x768       60.0
> 800x600        60.3     56.2     720x576        50.0     720x480        59.9
> 640x480        60.0  VGA-0 connected 1600x1200+3840+0 (normal left inverted
> right x axis y axis) 408mm x 306mm
>    1600x1200      60.0*+
>    1280x1024      75.0     60.0     1280x960       60.0     1152x864
> 75.0     1024x768       75.1     70.1     60.0     832x624        74.6
> 800x600        72.2     75.0     60.3     56.2     640x480        72.8
> 75.0     66.7     60.0     720x400        70.1
> Any suggestions on how to make a working xorg.conf?
>
> Fedora 18 x86_64:
> xorg-x11-server-Xorg-1.13.3-3.fc18.x86_64
> xorg-x11-drv-ati-7.0.0-0.9.20121015gitbd9e2c064.fc18.x86_64
> $ xrandr --version
> xrandr program version       1.4.0
> Server reports RandR version 1.4
> --
> Nick Urbanik             http://nicku.org           nicku at nicku.org
> GPG: 7FFA CDC7 5A77 0558 DC7A 790A 16DF EC5B BB9D 2C24 ID: BB9D2C24
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