Wayland information for r545 beta release

Graphics / Linux Linux
1

There are several areas in which the R545 NVIDIA driver lacks feature parity
between X11 and Wayland. These may be due to limitations of the driver itself,
the Wayland protocol, or the specific Wayland compositor in use. Over time
this list is expected to shorten as missing functionality is implemented both
in the driver and in upstream components, but the following captures the
situation as of the release of this driver version. Note that this assumes a
compositor with reasonably complete support for graphics-related Wayland
protocol extensions.

NVIDIA DRIVER LIMITATIONS

  • The NvFBC desktop capture library does not have native Wayland support
    and does not work with Xwayland.

  • Variable display refresh rate capabilities such as G-Sync are supported
    on Volta or newer GPUs with Wayland. Older GPUs are not supported.

  • EGL_EXT_platform_x11 is not supported with Xwayland.

  • The nvidia-drm module does support the DEGAMMA_LUT, CTM, and GAMMA_LUT
    CRTC properties. However the COLOR_ENCODING and COLOR_RANGE plane
    properties are unsupported. This may impact some advanced compositor
    features related to color correction.

  • The nvidia-settings configuration tool has limited functionality on
    Wayland.

  • Front-buffer rendering in GLX does not work with Xwayland.

WAYLAND PROTOCOL OR COMPOSITOR LIMITATIONS

  • The following workstation features are not supported by any Wayland
    compositors or the Wayland protocol. They will also likely require new
    EGL extensions or other means to expose the related hardware
    functionality.

    • SLI Mosaic

    • Frame Lock and Genlock

    • Swap Groups

    • Advanced display pipeline features including warp and blend, pixel shift,
      and emulated YUV420.

    • Stereo rendering

  • There is no established public API through which Wayland compositors can
    power off video memory via RTD3.

  • Xwayland does not provide a suitable mechanism for our driver to
    synchronize application rendering with presentation, which can cause
    visual corruption in some circumstances.

  • Display multiplexers (muxes) are typically used in laptops with both
    integrated and discrete GPUs to provide a direct connection between the
    discrete GPU and the built-in display (internal mux) or an external
    display (external mux). On X11, the display mux can be automatically
    switched when a full-screen application is running on the discrete GPU,
    enabling enhanced display features and improved performance, but no
    Wayland compositors currently support this functionality.

  • Indirect GLX does not work with Xwayland because the Glamor rendering
    engine is not compatible with our EGL implementation.

  • Hardware overlays cannot be used by GLX applications with Xwayland.

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