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<h2 class="title"><a name="gpunames" id=
"gpunames"></a>Appendix K. GPU Names</h2>
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<p>Many X configuration options that take a display device name can
also be qualified with a GPU. This is done by prepending one of the
GPU's names to the display device name. For example, the
"MetaModes" X configuration option can be used to enable display
devices from multiple GPUs in SLI Mosaic or Base Mosaic
configurations:</p>
<pre class="screen">
Option "MetaModes" "1280x1024 +0+0, 1280x1024 +1280+0"
</pre>
<p>You can use a display device name qualifier along with a GPU
qualifier to configure which display should be picked and from
which GPU. E.g.,</p>
<pre class="screen">
Option "MetaModes" "GPU-1.DFP-0:1280x1024 +0+0, GPU-0.DFP-0:1280x1024 +1280+0"
</pre>
<p></p>
<p>Other X configuration options that support GPU names
include:</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>ColorRange</p>
</li>
<li>
<p>ColorSpace</p>
</li>
<li>
<p>ConnectedMonitor</p>
</li>
<li>
<p>CustomEDID</p>
</li>
<li>
<p>FlatPanelProperties</p>
</li>
<li>
<p>IgnoreEDIDChecksum</p>
</li>
<li>
<p>ModeValidation</p>
</li>
<li>
<p>nvidiaXineramaInfoOrder</p>
</li>
<li>
<p>UseDisplayDevice</p>
</li>
<li>
<p>UseEdidFreqs</p>
</li>
</ul>
</div>
<p>The description of each X configuration option in <a href=
"xconfigoptions.html" title=
"Appendix B. X Config Options">Appendix B, <i>X
Config Options</i></a> provides more detail on the available syntax
for each option.</p>
<p>To find all available names for your configuration, start the X
server with verbose logging enabled (e.g., <strong class=
"userinput"><code>startx -- -logverbose 5</code></strong>, or
enable the "ModeDebug" X configuration option with <strong class=
"userinput"><code>nvidia-xconfig --mode-debug</code></strong> and
restart the X server).</p>
<p>The X log (normally /var/log/Xorg.0.log) will contain
information regarding each GPU. E.g.,</p>
<pre class="screen">
(II) NVIDIA(0): NVIDIA GPU NVS 510 (GK107) at PCI:15:0:0 (GPU-0)
(II) NVIDIA(0): VERBOSE: GPU UUID: GPU-758a4cf7-0761-62c7-9bf7-c7d950b817c6
</pre>
<p></p>
<p>Alternatively, nvidia-xconfig can be used to query the GPU
names: <strong class="userinput"><code>nvidia-xconfig
--query-gpu-info</code></strong></p>
<pre class="screen">
GPU #0:
Name : NVS 510
UUID : GPU-758a4cf7-0761-62c7-9bf7-c7d950b817c6
PCI BusID : PCI:3:0:0
</pre>
<p></p>
<p>Each name has different properties that may affect which name is
appropriate to use. The possible names are:</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>An NV-CONTROL target ID-based name (e.g., "GPU-0"). The NVIDIA X
driver will assign a unique ID to each GPU on the entire X server.
These IDs are not guaranteed to be persistent from one run of the X
server to the next, so is likely not convenient for X configuration
file use. It is more frequently used in communication with
NV-CONTROL clients such as nvidia-settings.</p>
</li>
<li>
<p>An UUID-based name (e.g.,
"GPU-758a4cf7-0761-62c7-9bf7-c7d950b817c6"). This name is a SHA-1
hash, formatted in canonical UUID 8-4-4-4-12 format. This UUID is
unique for each physical GPU, and will be the same regardless of
where the GPU is connected.</p>
</li>
</ul>
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