Multi gpu display

[Alex Deucher]

On Mon, Jul 3, 2017 at 4:32 AM, zhoucm1 <david1.zhou at amd.com> wrote:
> Hi xorg-devel guys,
>
> Anyone can help me?
>
> I tried two gpu card with four monitors on Unbuntu 16.04, each gpu has two
> monitors.
> By default config, I can see four monitors all are lighting with its
> separate desktop instance, and the running application with small window can
> be spanning all monitors, but if application only can be run on one of
> monitros with fullscreen setting. I attached Xorg log and xrandr output
> info.
>
> How should I configure if I want to all monitors as a big desktop or the
> full screen application can run on all monitors? or How should I do/change?

You'd need to configure it in the window manager.  Most window
managers use the geometry info advertised via randr to define what is
considered full screen.  You need to tell it to ignore that and just
use the full surface size.  How to do that varies from window manager
to window manager.

Alex