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HP-UX Configuration
ATI RADEON 7500 PCI Graphics Controller Installation Guide
Multihead Support
Multihead support is provided through changes to the Xserver's configuration file which is located at
/etc/X11/XF86Config. In order to do this correctly, you will need to know which device files to use. See
"Verification of Hardware Installation" on page 17 for details on how to determine which device files to
use.
Dual-screen
By default, an ATI RADEON 7500 appears as a single screen device. You can configure your system so
two screens are created with the signal of the first screen (:0.0) coming out the VGA port and the signal
of the second screen (:0.1) coming out the DVI-I port. Configuring your system for two screens on the
single ATI RADEON 7500 board is referred to as dual-screen mode.
XF86Config Changes
There are three sections in the configuration file you need to change:
1. ServerLayout section. The ServerLayout section contains references to the Screen: sections.
2. Screen sections. The Screen sections in turn contain references to the Device sections.
3. Device sections.
For this example, we will assume there are two ATI RADEON 7500 graphics controllers in the system.
These graphics cards have the device files /dev/gvid0 and /dev/gvid1. We will change the XF86Config
file to allow for a three-screened multihead system. The first graphics card (e.g. /dev/gvid0) is dual-
screened and the second graphics card is single-screened.
The lowest level is the Device section. This maps a physical device to a device identifier. The three
Device sections for this example are as follows:
Section "Device"
Identifier
"ATI Radeon 7500 QW(0) Connector 1"
DeviceFile "/dev/gvid0"
EndSection
Section "Device"
Identifier
"ATI Radeon 7500 QW(0) Connector 2"
DeviceFile "/dev/gvid0"
Screen
EndSection
Section "Device"
Identifier
"ATI Radeon 7500 QW(1) Connector 1"
DeviceFile "/dev/gvid1"
EndSection
The first device, ATI Radeon 7500 QW(0) Connecter 1 is the first screen on the first device. The second
device, ATI Radeon 7500 QW(0) Connecter 2 is the second screen on the first device. Note that it has
the Screen 1 field, which selects the second video output on the graphics card. If this field is omitted, it
is assumed the device is using the first video output on the graphics card. The third device, ATI Radeon
7500 QW(1) Connecter 1 is the first screen on the second device.
Once the Device sections are defined, you can define the Screen section, which maps a screen to a
physical device. The Screen sections use the Identifier field that was defined for each of the Device
sections. The three Screen sections for this example are as follows:
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Chapter 4
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Troubleshooting
