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<title>Chapter 13. Configuring GLX in Xinerama</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.68.1">
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"NVIDIA Accelerated Linux Graphics Driver README and Installation Guide">
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<link rel="up" href="installationandconfiguration.html" title=
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"Part I. Installation and Configuration Instructions">
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"Chapter 12. Configuring Multiple Display Devices on One X Screen">
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"Chapter 14. Configuring Multiple X Screens on One Card">
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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">Chapter 13. Configuring
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GLX in Xinerama</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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"configtwinview.html">Prev</a> </td>
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<th width="60%" align="center">Part I. Installation and
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Configuration Instructions</th>
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<td width="20%" align="right"> <a accesskey="n" href=
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"configmultxscreens.html">Next</a></td>
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</tr>
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</table>
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<hr></div>
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<div class="chapter" 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="xineramaglx" id=
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"xineramaglx"></a>Chapter 13. Configuring GLX in
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Xinerama</h2>
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</div>
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</div>
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</div>
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<p>The NVIDIA Linux Driver supports GLX when Xinerama is enabled on
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similar GPUs. The Xinerama extension takes multiple physical X
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screens (possibly spanning multiple GPUs), and binds them into one
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logical X screen. This allows windows to be dragged between GPUs
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and to span across multiple GPUs. The NVIDIA driver supports
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hardware accelerated OpenGL rendering across all NVIDIA GPUs when
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Xinerama is enabled.</p>
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<p>To configure Xinerama</p>
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<div class="orderedlist">
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<ol type="1">
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<li>
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<p>Configure multiple X screens (refer to the xorg.conf man page
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for details).</p>
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</li>
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<li>
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<p>Enable Xinerama by adding the line</p>
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<pre class="screen">
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Option "Xinerama" "True"
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</pre>
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<p>to the "ServerFlags" section of your X config file.</p>
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</li>
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</ol>
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</div>
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<p></p>
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<p>Requirements:</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>Using identical GPUs is recommended. Some combinations of
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non-identical, but similar, GPUs are supported. If a GPU is
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incompatible with the rest of a Xinerama desktop then no OpenGL
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rendering will appear on the screens driven by that GPU. Rendering
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will still appear normally on screens connected to other supported
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GPUs. In this situation the X log file will include a message of
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the form:</p>
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<pre class="screen">
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(WW) NVIDIA(2): The GPU driving screen 2 is incompatible with the rest of
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(WW) NVIDIA(2): the GPUs composing the desktop. OpenGL rendering will
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(WW) NVIDIA(2): be disabled on screen 2.
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</pre></li>
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<li>
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<p>NVIDIA's GLX implementation only supports Xinerama when physical
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X screen 0 is driven by the NVIDIA X driver. This is because the
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X.Org X server bases the visuals of the logical Xinerama X screen
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on the visuals of physical X screen 0.</p>
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<p>When physical X screen 0 is not being driven by the NVIDIA X
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driver and Xinerama is enabled, then GLX will be disabled. If
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physical X screens other than screen 0 are not being driven by the
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NVIDIA X driver, OpenGL rendering will be disabled on them.</p>
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</li>
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<li>
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<p>Only the intersection of capabilities across all GPUs will be
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advertised.</p>
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<p>The maximum OpenGL viewport size is 16384x16384 pixels. If an
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OpenGL window is larger than the maximum viewport, regions beyond
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the viewport will be blank.</p>
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</li>
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<li>
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<p>X configuration options that affect GLX operation (e.g.: stereo,
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overlays) should be set consistently across all X screens in the X
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server.</p>
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</li>
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</ul>
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</div>
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<p></p>
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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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"configtwinview.html">Prev</a> </td>
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<td width="20%" align="center"><a accesskey="u" href=
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"installationandconfiguration.html">Up</a></td>
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<td width="40%" align="right"> <a accesskey="n" href=
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"configmultxscreens.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">
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Chapter 12. Configuring Multiple Display Devices on One X
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Screen </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">
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Chapter 14. Configuring Multiple X Screens on One
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Card</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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