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<h2 class="title"><a name="configmultxscreens" id=
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X Screens on One Card</h2>
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<p>GPUs that support TwinView (<a href="configtwinview.html" title=
"Chapter 12. Configuring Multiple Display Devices on One X Screen">Chapter 12,
<i>Configuring Multiple Display Devices on One X Screen</i></a>)
can also be configured to treat each connected display device as a
separate X screen.</p>
<p>While there are several disadvantages to this approach as
compared to TwinView (e.g.: windows cannot be dragged between X
screens, hardware accelerated OpenGL cannot span the two X
screens), it does offer one advantage over TwinView: If each
display device is a separate X screen, then properties that may
vary between X screens may vary between displays (e.g.: depth, root
window size, etc).</p>
<p>To configure two separate X screens to share one graphics card,
here is what you will need to do:</p>
<p>First, create two separate Device sections, each listing the
BusID of the graphics card to be shared and listing the driver as
"nvidia", and assign each a separate screen:</p>
<pre class="screen">
Section "Device"
Identifier "nvidia0"
Driver "nvidia"
# Edit the BusID with the location of your graphics card
BusID "PCI:2:0:0"
Screen 0
EndSection
Section "Device"
Identifier "nvidia1"
Driver "nvidia"
# Edit the BusID with the location of your graphics card
BusId "PCI:2:0:0"
Screen 1
EndSection
</pre>
<p>Then, create two Screen sections, each using one of the Device
sections:</p>
<pre class="screen">
Section "Screen"
Identifier "Screen0"
Device "nvidia0"
Monitor "Monitor0"
DefaultDepth 24
Subsection "Display"
Depth 24
Modes "1600x1200" "1024x768" "800x600" "640x480"
EndSubsection
EndSection
Section "Screen"
Identifier "Screen1"
Device "nvidia1"
Monitor "Monitor1"
DefaultDepth 24
Subsection "Display"
Depth 24
Modes "1600x1200" "1024x768" "800x600" "640x480"
EndSubsection
EndSection
</pre>
<p>(Note: You'll also need to create a second Monitor section)
Finally, update the ServerLayout section to use and position both
Screen sections:</p>
<pre class="screen">
Section "ServerLayout"
...
Screen 0 "Screen0"
Screen 1 "Screen1" leftOf "Screen0"
...
EndSection
</pre>
<p>For further details, refer to the XF86Config(5x) or
xorg.conf(5x) man pages.</p>
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