Multiseat with VGAArbiter on 2 Radeon cards

Tiago Vignatti tiago.vignatti at
Sat Dec 5 09:29:37 PST 2009

On Fri, Dec 04, 2009 at 09:00:19PM +0100, ext Steffen Schaumburg wrote:
> Hi everyone,
> I'm trying to setup multiseat with 2 radeon cards using the new-ish VGA
> arbiter thing. The latest info I could find about it is dated July and
> said that one needs to get certain things from git but since linux
> 2.6.32 has arbiter I figured I give it a go. So I guess here is my first
> question really: should this work with current release versions of X etc.?

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 in low-res on
> just the monitor on the primary card. This is how it used to be when I
> had just one card and I don't mind.
> Then when kdm starts it turns the second monitor on (so far so good) but
> then nothing. The primary monitor loads kdm as expected but the second
> one stays on but black. It doesn't go into standby even after hours.
> I tried swapping the monitors in kdmrc and it does exactly that - after
> the swap the secondary monitor loads kdm as wanted, but the primary
> monitor now turns on but stays black. This is the configuration I'm
> using now.

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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