[vfio-users] Dual monitor with spice display + hdmi

[Daimon Wang]

Yes, I can confirm that a PC with on-board Intel card and an NV card can be configured for dual-monitor, with Aero on. And I can make a video window across both screen.However, I haven't success with Linux host. I've read in another thread that you can start 2 X server, each for one card.
While for VM, the qemu pass-through readme said IGD card can be the secondary card for calculation only (so no output). This mode is named "Universal Pass-Through", so maybe the NV card in this mode will have the same behavior?
Regards,Daimon 

    On Thursday, January 19, 2017 3:57 AM, Jayme Howard <g.prime at gmail.com> wrote:
 

 It just treats them as independent displays.  It can either mirror them, or extend the desktop onto multiple.  It can't do multiple independent desktops.  A real life example of this is a motherboard with onboard video coupled with a discrete GPU in a slot.  As long as the onboard isn't disabled, they can work in tandem, at least for software rendering.  From what I understand, as well, DirectX 12 and Vulkan both support hardware rendering with multiple GPUs of different brands.
On Wed, Jan 18, 2017 at 1:45 PM, Will Marler <will at wmarler.com> wrote:

That's an interesting scenario ... How does Windows handle multiple graphics cards? Like, let's say this was all bare metal, and the machine had 2 different models of nVidia cards and an ATI card, with a monitor connected to each card. Would Windows be able to display a desktop on each monitor, or span a single contiguous desktop across them? If yes then I'd guess that what you're asking is at least theoretically possible, though I've never tested personally.
On Wed, Jan 18, 2017 at 12:19 PM, Jayme Howard <g.prime at gmail.com> wrote:

I've used both together, but I don't remember if one was mirroring the other or if I did it as dual-monitor.  It was a configuration I abandoned early on.  It DID work, but it caused (about 75% of the time) Nvidia code 43 issues for me.  But it definitely did work outside of that.
On Wed, Jan 18, 2017 at 1:08 PM, Doug Applegate <doug.applegate at gmail.com> wrote:

Is it possible for a guest VM to use both spice server graphics with
qxl video AND hdmi gpu passthrough? Could the guest be configured
(windows 10 in this case) see it as a dual-monitor setup?

Has anyone tried this or gotten it to work?

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