180 lines
5.7 KiB
HTML
180 lines
5.7 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta name="generator" content=
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"HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org">
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<meta http-equiv="Content-Type" content=
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"text/html; charset=us-ascii">
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<title>Appendix L. Wayland Known Issues</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.68.1">
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<link rel="start" href="index.html" title=
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"NVIDIA Accelerated Linux Graphics Driver README and Installation Guide">
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<link rel="up" href="appendices.html" title=
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"Part II. Appendices">
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<link rel="prev" href="gpunames.html" title=
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"Appendix K. GPU Names">
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</head>
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<body>
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<div class="navheader">
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Appendix L. Wayland Known
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Issues</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href=
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"gpunames.html">Prev</a> </td>
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<th width="60%" align="center">Part II. Appendices</th>
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<td width="20%" align="right"> </td>
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</tr>
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</table>
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<hr></div>
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<div class="appendix" lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title"><a name="wayland-issues" id=
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"wayland-issues"></a>Appendix L. Wayland Known
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Issues</h2>
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</div>
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</div>
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</div>
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<h3>Overview</h3>
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<p>There are several areas in which the NVIDIA driver lacks feature
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parity between X11 and Wayland. These may be due to limitations of
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the driver itself, the Wayland protocol, or the specific Wayland
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compositor in use. Over time this list is expected to shorten as
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missing functionality is implemented both in the driver and in
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upstream components, but the following captures the situation as of
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the release of this driver version. Note that this assumes a
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compositor with reasonably complete support for graphics-related
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Wayland protocol extensions.</p>
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<h3>NVIDIA Driver Limitations</h3>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>The VDPAU library (<a href="vdpausupport.html" title=
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"Appendix G. VDPAU Support">Appendix G, <i>VDPAU
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Support</i></a>), used for hardware accelerated video decoding and
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presentation, does not have native Wayland support and does not
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work with Xwayland.</p>
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</li>
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<li>
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<p>The NvFBC desktop capture library does not have native Wayland
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support and does not work with Xwayland.</p>
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</li>
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<li>
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<p>Variable display refresh rate capabilities such as G-Sync are
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supported on Volta or newer GPUs with Wayland. Older GPUs are not
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supported.</p>
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</li>
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<li>
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<p>Virtual reality displays, such as the SteamVR platform, require
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support for DRM display leasing which does not currently work.</p>
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</li>
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<li>
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<p>EGL_EXT_platform_x11 is not supported with Xwayland.</p>
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</li>
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<li>
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<p>The nvidia-drm module does not support the GAMMA_LUT,
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DEGAMMA_LUT, CTM, COLOR_ENCODING, or COLOR_RANGE connector
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properties, which may impact some compositor features related to
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color correction.</p>
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</li>
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<li>
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<p>The nvidia-settings configuration tool has limited functionality
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on Wayland.</p>
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</li>
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<li>
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<p>Front-buffer rendering in GLX does not work with Xwayland.</p>
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</li>
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</ul>
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</div>
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<h3>Wayland Protocol or Compositor Limitations</h3>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>The following workstation features are not supported by any
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Wayland compositors or the Wayland protocol. They will also likely
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require new EGL extensions or other means to expose the related
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hardware functionality.</p>
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<div class="itemizedlist">
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<ul type="circle">
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<li>
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<p>SLI and Multi-GPU Mosaic (<a href="sli.html" title=
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"Chapter 31. Configuring SLI and Multi-GPU Mosaic">Chapter 31,
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<i>Configuring SLI and Multi-GPU Mosaic</i></a>)</p>
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</li>
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<li>
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<p>Frame Lock and Genlock (<a href="framelock.html" title=
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"Chapter 32. Configuring Frame Lock and Genlock">Chapter 32,
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<i>Configuring Frame Lock and Genlock</i></a>)</p>
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</li>
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<li>
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<p>Swap Groups</p>
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</li>
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<li>
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<p>Advanced display pipeline features including warp and blend,
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pixel shift, and emulated YUV420.</p>
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</li>
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<li>
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<p>Stereo rendering</p>
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</li>
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</ul>
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</div>
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</li>
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<li>
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<p>There is no established public API through which Wayland
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compositors can power off video memory via RTD3 (<a href=
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"dynamicpowermanagement.html" title=
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"Chapter 22. PCI-Express Runtime D3 (RTD3) Power Management">Chapter 22,
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<i>PCI-Express Runtime D3 (RTD3) Power Management</i></a>).</p>
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</li>
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<li>
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<p>Xwayland does not provide a suitable mechanism for our driver to
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synchronize application rendering with presentation, which can
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cause visual corruption in some circumstances.</p>
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</li>
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<li>
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<p>Display multiplexers (muxes) are typically used in laptops with
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both integrated and discrete GPUs to provide a direct connection
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between the discrete GPU and the built-in display (internal mux) or
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an external display (external mux). On X11, the display mux can be
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automatically switched when a full-screen application is running on
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the discrete GPU, enabling enhanced display features and improved
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performance, but no Wayland compositors currently support this
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functionality.</p>
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</li>
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<li>
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<p>Indirect GLX does not work with Xwayland because the Glamor
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rendering engine is not compatible with our EGL implementation.</p>
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</li>
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<li>
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<p>Hardware overlays cannot be used by GLX applications with
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Xwayland.</p>
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</li>
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</ul>
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</div>
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</div>
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<div class="navfooter">
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<hr>
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href=
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"gpunames.html">Prev</a> </td>
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<td width="20%" align="center"><a accesskey="u" href=
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"appendices.html">Up</a></td>
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<td width="40%" align="right"> </td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Appendix K. GPU
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Names </td>
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<td width="20%" align="center"><a accesskey="h" href=
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"index.html">Home</a></td>
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<td width="40%" align="right" valign="top"> </td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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