On Tue, Aug 8, 2017 at 11:46 PM, David Niklas <doark@xxxxxxxx> wrote: > BTW: I'm on list, no need to CC. > > On Wed, 9 Aug 2017 10:38:23 +0900 > Michel Dänzer <michel@xxxxxxxxxxx> 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). Full asic functionality is available for vega10 including displays in the branch Harry pointed out. > 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? If you use the kernel branch mentioned above, X will detect all relevant GPUs and you can use xrandr to dynamically configure what GPU(s) you want to display with or render with at runtime. You only need X for display. If you just want to use a GPU for offscreen graphics rendering or compute work, you don't need to be running X. Alex _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
