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<h2 class="title"><a name="xineramaglx" id=
"xineramaglx"></a>Chapter&nbsp;13.&nbsp;Configuring GLX in
Xinerama</h2>
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<p>The NVIDIA Linux Driver supports GLX when Xinerama is enabled on
similar GPUs. The Xinerama extension takes multiple physical X
screens (possibly spanning multiple GPUs), and binds them into one
logical X screen. This allows windows to be dragged between GPUs
and to span across multiple GPUs. The NVIDIA driver supports
hardware accelerated OpenGL rendering across all NVIDIA GPUs when
Xinerama is enabled.</p>
<p>To configure Xinerama</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>Configure multiple X screens (refer to the XF86Config(5x) or
xorg.conf(5x) man pages for details).</p>
</li>
<li>
<p>Enable Xinerama by adding the line</p>
<pre class="screen">
    Option "Xinerama" "True"
</pre>
<p>to the "ServerFlags" section of your X config file.</p>
</li>
</ol>
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<p></p>
<p>Requirements:</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>Using identical GPUs is recommended. Some combinations of
non-identical, but similar, GPUs are supported. If a GPU is
incompatible with the rest of a Xinerama desktop then no OpenGL
rendering will appear on the screens driven by that GPU. Rendering
will still appear normally on screens connected to other supported
GPUs. In this situation the X log file will include a message of
the form:</p>
<pre class="screen">
(WW) NVIDIA(2): The GPU driving screen 2 is incompatible with the rest of
(WW) NVIDIA(2):      the GPUs composing the desktop.  OpenGL rendering will
(WW) NVIDIA(2):      be disabled on screen 2.
</pre></li>
<li>
<p>NVIDIA's GLX implementation only supports Xinerama when physical
X screen 0 is driven by the NVIDIA X driver. This is because the
X.Org X server bases the visuals of the logical Xinerama X screen
on the visuals of physical X screen 0.</p>
<p>When physical X screen 0 is not being driven by the NVIDIA X
driver and Xinerama is enabled, then GLX will be disabled. If
physical X screens other than screen 0 are not being driven by the
NVIDIA X driver, OpenGL rendering will be disabled on them.</p>
</li>
<li>
<p>Only the intersection of capabilities across all GPUs will be
advertised.</p>
<p>The maximum OpenGL viewport size is 16384x16384 pixels. If an
OpenGL window is larger than the maximum viewport, regions beyond
the viewport will be blank.</p>
</li>
<li>
<p>X configuration options that affect GLX operation (e.g.: stereo,
overlays) should be set consistently across all X screens in the X
server.</p>
</li>
</ul>
</div>
<p></p>
<p>Known Issues:</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>Versions of XFree86 prior to 4.5 and versions of X.Org prior to
6.8.0 lack the required interfaces to properly implement overlays
with the Xinerama extension. On earlier server versions mixing
overlays and Xinerama will result in rendering corruption. If you
are using the Xinerama extension with overlays, it is recommended
that you upgrade to XFree86 4.5, X.Org 6.8.0, or newer.</p>
</li>
</ul>
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