Understanding Multi Display Support with Wayland/Weston

Daniel Stone daniel at fooishbar.org
Wed Aug 31 07:49:18 UTC 2016


On 30 August 2016 at 18:45, Armin Krezović <krezovic.armin at gmail.com> wrote:
> On 30.08.2016 09:06, Vikas Patil wrote:
>> 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.

These aren't things you tend to do in cars. :)

> 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.

The HMI component is responsible for window placement, including on
screens. This does actually work.

>> 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.

It's not possible: only one client can be the DRM master at a time,
which is required to do modesetting.


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