Understanding Multi Display Support with Wayland/Weston

Armin Krezović krezovic.armin at gmail.com
Tue Aug 30 17:45:11 UTC 2016

On 30.08.2016 09:06, Vikas Patil wrote:
> Dear All,
> I am trying to understand multi display support  with wayland/weston
> in any of the following mode with drm-backend and ivi-shell. Planning
> to use TI soc (Jacinto 6, DRA7XX) with linux to test multi display
> (dual).
> It would be great help if you could give inputs/information/suggest on this.
> 1. Extended Mode.
> - This seems to be available from guide from TI [1]. I assume this
> will be running one instance of weston with desktop-shell.
> - Is this posible with ivi-shell?

From a quick look, ivi-shell doesn't seem to support either window resizing or d&d.

It can use several screens, but with lack of functionality to move something to
a second screen, I'm not sure how it will be usable.

> 2. Clone Mode.
> - Is this possible? How to configure this?

Not yet possible I'm afraid.

> 3. Independent Driving.
> - Is this possible?
> - Are two instance of weston possible?

Two instances of weston are possible, and each instance can be configured to
drive a different output. However, I'm not sure if that's possible in the DRM
backend. As soon as you switch from a tty on which weston is running, weston
will suspend any rendering and outputs until the tty weston is running on is
switched to again.

Unless there's proper multi-seat support on the SoC's OS, I'm not sure if
you'll be able to do what you are planning to.

> Anyone here tried wayland/weston with multiple display in any of the
> above configuration?

Extended screens work under all the backends that support multiple outputs
(all but rdp and fbdev backends). Layout configuration is a work in progress,
meaning first screen will be placed top-left, and every new one will be
placed right next to it (or the one that was added last).

Cloned outputs aren't yet supported I'm afraid.

> Thanking you all in advance.
> [1] processors.wiki.ti.com/.../Processor_SDK_Linux_Automotive_Software_Developers_Guide
> Thanks & Regards,
> Vikash
> _______________________________________________
> wayland-devel mailing list
> wayland-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/wayland-devel

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