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praneethbajjuri merged 1 commit into from
Jan 8, 2025
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feat(weston): add note about weston backends #151

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17 changes: 15 additions & 2 deletions source/linux/Foundational_Components/Graphics/Common/Weston.rst
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Expand Up @@ -6,13 +6,25 @@ The supported Wayland/Weston version brings in the multiple display support in
extended desktop mode and the ability to drag-and-drop windows from one display
to the other.

Weston has support for multiple backends. By default it will use the ``drm``
backend unless the ``WAYLAND_DISPLAY`` environment variable is set. This backend
will register the compositor as the controller of the kms interface and will
pick up human interface device (HID) input using evdev.

If the ``WAYLAND_DISPLAY`` variable is set, Weston will attempt to use the
``wayland`` backend for nested composition. This is useful for development, but
is normally not what you want for standard composition use. See
:ref:`starting-weston-manually` or `the upstream weston documentation`_ for more
information.

.. ifconfig:: CONFIG_part_variant in ('AM62PX', 'J722S')

The |__PART_FAMILY_NAME__| group of devices actually utilizes two separate
DSS modules enumerated under two different :file:`/dev/dri/card*` devices.

Weston versions newer than ``11.0.91`` can specify additional card devices
via the ``--additional-devices`` command line parameter.
via the ``--additional-devices`` command line parameter when using the
``drm`` backend.

To launch Weston using both card0 and card1, you can use the following
command:
Expand Down Expand Up @@ -59,12 +71,13 @@ To inspect the systemd service and socket status, do the following:

# systemctl status weston.service weston.socket

.. _starting-weston-manually:

************************
Starting Weston Manually
************************

To launch Weston manually, do the following:
To launch Weston manually with the DRM backend, do the following:

On the target console:

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