BTW: I'm on list, no need to CC.

On Wed, 9 Aug 2017 10:38:23 +0900
Michel Dänzer <> wrote:

> On 09/08/17 05:12 AM, David Niklas wrote:
> > I know that currently some form of headless support already exists,
> > but then I'd have to use crossfire (which does not work with the
> > opensource driver AFAIK).  
> You don't need CrossFire to make use of a GPU in a headless fashion.

No, but you do if you intend to use your primary desktop machine and Vega
supports only headless, or as Harry pointed out, a display driver (which,
I am assuming means 2D only).
Besides, and as a side thought, I have had the temptation of using two
GPUs for compute tasks since it's just silly to toss/sell a GPU that
could be useful and is worth more to me than it's online value in dollars
(I have to choose the only GPU that actually goes *down* in price....)

> OpenCL should support that out of the box, and in X the GPU can be used
> for OpenGL apps via RandR 1.4 render offloading (obviously, you'll need
> another GPU in the system that X can use for output).

You've lost me.
Let my try to understand, and you correct me as I go astray.
1. X can send the OpenGL requests to another GPU while Vega does other
things or idles mindlessly in headless mode.
2. X can send the OpenGL requests to the Vega GPU while the other GPU
sends frames to the display from Vega.

Also, do I need to configure X using RandR, or will it "just work" ...
Stupid question, let me rephrase:
What do I need to do to tell RandR to get X to work?


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