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Dual-Head X with Radeon 9600

Created by dave. Last edited by dave, 10 years and 57 days ago. Viewed 2,603 times. #1
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Dual-Head LCD X on a ATI Radeon 9600

This is highly specific to my needs and may not do anything for you, but I have a bunch of these at one of my sites so I need to remember how to do it.

The problem encountered was that after installing RHEL 5.1, the system-config-display application could launch X to configure it, but very slowly, and would hang completely once the second display was enabled as a separate device. The out-of-the-box configuration was totally useless, with X hogging the CPU and the display being effectively unresponsive. You could still ssh into the box from other stations and kill things, but that's not especially useful.

One of the engineers had to mess around with this manually to make it work.

# Xorg configuration created by system-config-display

Section "ServerLayout" Identifier "Multihead layout" Screen 0 "Screen0" RightOf "Screen1" Screen 1 "Screen1" 0 0 InputDevice "Mouse0" "CorePointer" InputDevice "Keyboard0" "CoreKeyboard" Option "Xinerama" "on" Option "Clone" "on" EndSection

Section "Files"

# RgbPath is the location of the RGB database. Note, this is the name of the # file minus the extension (like ".txt" or ".db"). There is normally # no need to change the default. # Multiple FontPath entries are allowed (they are concatenated together) # By default, Red Hat 6.0 and later now use a font server independent of # the X server to render fonts. RgbPath "/usr/X11R6/lib/X11/rgb" FontPath "unix/:7100" EndSection

Section "Module" Load "dbe" Load "extmod" Load "fbdevhw" Load "glx" Load "record" Load "freetype" Load "type1" Load "dri" EndSection

Section "InputDevice"

# Specify which keyboard LEDs can be user-controlled (eg, with xset(1)) # Option "Xleds" "1 2 3" # To disable the XKEYBOARD extension, uncomment XkbDisable. # Option "XkbDisable" # To customise the XKB settings to suit your keyboard, modify the # lines below (which are the defaults). For example, for a non-U.S. # keyboard, you will probably want to use: # Option "XkbModel" "pc102" # If you have a US Microsoft Natural keyboard, you can use: # Option "XkbModel" "microsoft" # # Then to change the language, change the Layout setting. # For example, a german layout can be obtained with: # Option "XkbLayout" "de" # or: # Option "XkbLayout" "de" # Option "XkbVariant" "nodeadkeys" # # If you'd like to switch the positions of your capslock and # control keys, use: # Option "XkbOptions" "ctrl:swapcaps" # Or if you just want both to be control, use: # Option "XkbOptions" "ctrl:nocaps" # Identifier "Keyboard0" Driver "kbd" Option "XkbModel" "pc105" Option "XkbLayout" "us" EndSection

Section "InputDevice" Identifier "Mouse0" Driver "mouse" Option "Protocol" "IMPS/2" Option "Device" "/dev/input/mice" Option "ZAxisMapping" "4 5" Option "Emulate3Buttons" "yes" EndSection

Section "Monitor" Identifier "Monitor0" VendorName "Monitor Vendor" ModelName "LCD Panel 1680x1050" HorizSync 31.5 - 90.0 VertRefresh 60.0 - 60.0 Option "dpms" EndSection

Section "Monitor" Identifier "Monitor1" VendorName "Monitor Vendor" ModelName "LCD Panel 1680x1050" HorizSync 31.5 - 90.0 VertRefresh 60.0 - 60.0 Option "dpms" EndSection

Section "Device" Identifier "Videocard0" Driver "radeon" VendorName "Videocard vendor" BoardName "ATI Radeon 9600" EndSection

Section "Device" Identifier "Videocard1" Driver "radeon" VendorName "Videocard Vendor" BoardName "ATI Radeon 9600" BusID "PCI:1:0:0" Screen 1 EndSection

Section "Screen" Identifier "Screen0" Device "Videocard0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 16 Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480" EndSubSection SubSection "Display" Viewport 0 0 Depth 24 Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480" EndSubSection EndSection

Section "Screen" Identifier "Screen1" Device "Videocard1" Monitor "Monitor1" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 16 Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480" EndSubSection SubSection "Display" Viewport 0 0 Depth 24 Modes "1280x1024" "1280x960" "1024x768" "800x600" "640x480" EndSubSection EndSection

Section "DRI" Group 0 Mode 0666 EndSection

I don't know how much of my problem is a "dualhead sucks" problem and how much of it is a "xorg sucks" (or a "RHEL sucks") problem.

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This is a collection of techical information, much of it learned the hard way. Consider it a lab book or a /info directory. I doubt much of it will be of use to anyone else.

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