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docs: document DRI_PRIME

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Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17298>
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Pierre-Eric Pelloux-Prayer 2022-08-01 11:00:41 +02:00 • committed by Marge Bot
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docs/envvars.rst
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@ -192,6 +192,19 @@ Core Mesa environment variables
not they ever see a wait-before-signal condition.
:envvar:`MESA_LOADER_DRIVER_OVERRIDE`
chooses a different driver binary such as ``etnaviv`` or ``zink``.
:envvar:`DRI_PRIME`
the default GPU is the one used by Wayland/Xorg or the one connected to a
display. This variable allows to select a different GPU. It applies to OpenGL
and Vulkan (in this case "select" means the GPU will be first in the reported
physical devices list). The supported syntaxes are:
- ``DRI_PRIME=1``: selects the first non-default GPU.
- ``DRI_PRIME=pci-0000_02_00_0``: selects the GPU connected to this PCIe bus
- ``DRI_PRIME=vendor_id:device_id``: selects the first GPU matching these ids
.. note::
``lspci -nn | grep VGA`` can be used to know the PCIe bus or ids to use.
NIR passes environment variables
--------------------------------