Multiseat with VGAArbiter on 2 Radeon cards

Steffen Schaumburg steffen at
Sat Dec 5 11:43:06 PST 2009

Okay I figured I might as well try Tiago's idea. I'm not sure what if I
used the right command but here's what I tried:
xterm -display :1 -e bash &
xterm -display :1.0 -e bash &
xterm -display localhost:1 -e bash &
xterm -display localhost:1.0 -e bash &

I tried all four as both root and user and they all fail saying "Can't
open display: localhost:1.0" (with different display depending on what I

Thanks, Steffen

Steffen Schaumburg wrote:
> Hi,
> thanks both of you for your replies - I'm going to try the KMS method
> first. Now the problem is I can't turn off Arbiter in the kernel, make
> menuconfig can find it with the search, but the option isn't in the
> menu. Is there a boot option to force off arbiter (or, alternatively, to
> force on KMS which would turn off arbiter by necessity?)? I checked the
> docs at
> but can't see anything. Or should I just manually edit the .config file
> - I'm inclined to trust menuconfig to not be displaying the option for a
> reason, or am I giving it too much credit? Any pointers would be
> appreciated.
> Thanks, Steffen
> Corbin Simpson wrote:
>> Multicard and multiseat for radeon doesn't need vgaarb; use KMS
>> instead and your cards will both come up at boot.
>> Posting from a mobile, pardon my terseness. ~ C.
>>> On Dec 5, 2009 9:30 AM, "Tiago Vignatti" <tiago.vignatti at
>>> <mailto:tiago.vignatti at>> wrote:
>>> On Fri, Dec 04, 2009 at 09:00:19PM +0100, ext Steffen Schaumburg
>>> wrote: > Hi everyone, > I'm trying ...
>>> yes. And the log says you're indeed using it.
>>>> The current status of my work is: > >From pressing the power button
>>> to kdm loading it displays i...
>>> humm, seems not issue with vga arbitration. I'd guess maybe missed mode
>>> setting. Try to start an app on the monitor black and see if
>>> connects. If this
>>> succeeds then the arbiter is doing its job okay.
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