@JamesRobinson: Yes, your "ZaphodHeads" trick worked for my three-monitor
set-up. I now have Xinerama working correctly across all three monitors.
Here is the xorg.conf file:
Section "ServerLayout"
Identifier "Ian"
Screen "Screen Left" 0 0
Screen "Screen Middle" RightOf "Screen Left"
Screen "Screen Right" RightOf "Screen Middle"
Option "Xinerama"
EndSection
Section "Screen"
Identifier "Screen Left"
Device "Device Left"
# this isn't absolutely necessary but it helps window placement
SubSection "Display"
Virtual 1600 1200
EndSubSection
EndSection
Section "Screen"
Identifier "Screen Middle"
Device "Device Middle"
# this isn't absolutely necessary but it helps window placement
SubSection "Display"
Virtual 1600 1200
EndSubSection
EndSection
Section "Screen"
Identifier "Screen Right"
Device "Device Right"
# this isn't absolutely necessary but it helps window placement
SubSection "Display"
Virtual 1600 1200
EndSubSection
EndSection
Section "Device"
Identifier "Device Left"
Driver "radeon"
VendorName "ATI Technologies Inc"
BoardName "FireMV 2250"
BusID "PCI:4:0:0"
Option "ZaphodHeads" "DVI-0"
Screen 0
EndSection
Section "Device"
Identifier "Device Middle"
Driver "radeon"
VendorName "ATI Technologies Inc"
BoardName "FireMV 2250"
BusID "PCI:4:0:0"
Option "ZaphodHeads" "DVI-1"
Screen 1
EndSection
Section "Device"
Identifier "Device Right"
Driver "nv"
VendorName "nVidia Corporation"
BoardName "G86 [GeForce 8300 GS]"
BusID "PCI:5:0:0"
Screen 0
EndSection
--
wrong xinerama scroll/pan using two cards three monitors
https://bugs.launchpad.net/bugs/591104
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