HP xw3400 User Manual page 87

Each device will appear by its VGA controller address. Specify the XF86Config BusID address as
ìPCI:128:0:0î or ìPCI:64:1:0î as seen below in Figure 3.
For graphics cards with multiple video output ports, each port usually defines a unique device. In
order for the X server to properly address a single card with two ports, two device descriptions with
the same BusID are defined but with different Device section Screen numbers. The use of the term
Screen is private and unique to this section. It identifies the video output port within a range of zero to
N-1 ports [usually 0 or 1 for a two-headed card]. The first port always starts at zero. For example, an
NVIDIA 980XGL or 280NVS might be described as:
Section ìDeviceî
EndSection
Section ìDeviceî
EndSection
This effectively describes two available graphics devices to the X server located at the same bus
address. Note: When using the NVIDIA TwinView option to unite screens, the Device section
Screen numbers are optional and may not always be necessary to uniquely identify the output port.
Screen section — The configuration file contains one Screen section for each combination of
Monitor and Device defined elsewhere in the file. Each Screen effectively defines one video
display of a user's workstation. Note: the usage of Screen here differs from that used in the Device
section as a port number ID.
Section ìScreenî
Bus 64, device 1, function 0:
VGA compatible controller: nVidia Corporation NV34GL
[Quadro4
280/400 NVS] (rev a2).
Ö
Bus 128, device 0, function 0:
VGA compatible controller: nVidia Corporation NV25GL
[Quadro4
980 XGL] (rev 163).
Ö
Figure 3. /proc/pci output
Identifier ìPCIe_card_port0î
Driver ìnvidiaî
Ö
BusID ìPCI:64:0:0î
Screen 0
Identifier ìPCIe_card_port1î
Driver ìnvidiaî
Ö
BusID ìPCI:64:0:0î
Screen 1
Identifier ìnameî
Device ìdevice_identifierî
Monitor ìmonitor_identifierî
entries
Ö
DefaultDepth 24
Ö
SubSection ìDisplayî
Depth 24
Modes ì1280x1024î ì1024x768î ì800x600î
entries
Ö
EndSubSection
# PCIe slot
# port zero
# PCIe slot
# port one
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