Dual head on ATI FirePro M5800

[Alex Deucher]

On Mon, Oct 4, 2010 at 5:37 PM, Ole Tange <ole at tange.dk> wrote:
> I am trying to get dual head on ATI FirePro M5800 working. LVDS works,
> but VGA-0 is in power save mode no matter what I do.
>
> My colleague got the non-free driver working, but I would prefer using
> the free driver. My research seems to indicate the chipset is called
> Redwood or r8xx or RV830 or r800 or Evergreen - but I could be wrong.
>
> I have been unable to find a guide for this card and the obvious
> (xrandr --output LVDS --output VGA-0 --left-of LVDS) does not work.
> Neither does KDE's gui config of display.
>
> Below is some output that may help.

If you are not already, your best bet is to use KMS.  Some evergreen
vbioses had a bug in the i2c table for the VGA port.  Make sure your
kernel has this patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=ea39302b87b8d944d567ef29c0647c09da5743fa
or better yet, try 2.6.36.

Alex

>
> /Ole
>
> $ lspci |grep VGA
> 01:00.0 VGA compatible controller: ATI Technologies Inc Device 68c0
>
> $ cat /etc/X11/xorg.conf
> Section "Screen"
>        Identifier      "Configured Screen Device"
>        Device  "Configured Video Device"
>        SubSection "Display"
>                Virtual 3280 1080
>        EndSubSection
> EndSection
>
> Section "Device"
>        Identifier      "Configured Video Device"
> EndSection
>
> $ xrandr
> Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 3280 x 1080
> LVDS connected 1920x1080+0+0 (normal left inverted right x axis y
> axis) 0mm x 0mm
>   1920x1080      59.9*+
>   1680x1050      60.0
>   1600x1024      60.2
>   1400x1050      60.0     60.0
>   1280x1024      59.9     60.0
>   1440x900       59.9     59.9
>   1280x960       60.0     59.9
>   1280x854       59.9
>   1360x768       59.8
>   1280x800       59.8
>   1152x864       60.0
>   1280x720       59.9
>   1152x768       59.8
>   1024x768       60.0     59.9
>   800x600        60.3     59.9
>   640x480        59.9     59.4
> DisplayPort-2 disconnected (normal left inverted right x axis y axis)
> DisplayPort-1 disconnected (normal left inverted right x axis y axis)
> DisplayPort-0 disconnected (normal left inverted right x axis y axis)
> VGA-0 connected (normal left inverted right x axis y axis)
>   1360x768       59.8
>   1152x864       60.0
>   1024x768       60.0
>   800x600        60.3
>   640x480        59.9
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