[Solved] Re: Dual head on ATI FirePro M5800

[Ole Tange]

On Wed, Oct 20, 2010 at 10:51 PM, Alex Deucher <alexdeucher at gmail.com> wrote:
> On Wed, Oct 20, 2010 at 10:09 AM, Ole Tange <ole at tange.dk> wrote:
>> On Tue, Oct 5, 2010 at 1:37 AM, Alex Deucher <alexdeucher at gmail.com> wrote:
>>> 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.

The problem was that /etc/modules did not contain 'radeon'. After
adding that and rebooting everything worked.

I also tried 'modprobe radeon' while running X. This is is not
recommendable: Apparently that confused X so the display got screwed
up but X kept running.

I cannot tell if the kernel upgrade to 2.6.36 was necessary.

/Ole