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Dual Head (two monitors, one card) not working

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I've followed the HOWTO for setting up dual monitors on my Radeon 7500 graphics card, with one CRT and one LCD (Targa visionary) - I changed xorg.conf (see relevant bit below) but the Gnome GDM says theres a configuration error and won't run X
Can anyone spot what may be wrong?

/etc/X11/xorg.conf:
...
Section "Device"
Identifier "0 ATI Technologies Inc Radeon RV200 QW [Radeon 7500]"
Driver "ati"
BusID "PCI:1:0:0"
Screen 0
Option "MonitorLayout" "TMDS, CRT"
EndSection

Section "Device"
Identifier "1 ATI Technologies Inc Radeon RV200 QW [Radeon 7500]"
Driver "ati"
BusID "PCI:1:0:0"
Screen 1
Option "MonitorLayout" "TMDS, CRT"
EndSection

Section "Monitor"
Identifier "Main Monitor"
Option "DPMS"
EndSection

Section "Monitor"
Identifier "Second Monitor"
Option "DPMS"
EndSection

Section "Screen"
Identifier "Main Screen"
Device "0 ATI Technologies Inc Radeon RV200 QW [Radeon 7500]"
Monitor "Main Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
EndSection

Section "Screen"
Identifier "Second Screen"
Device "1 ATI Technologies Inc Radeon RV200 QW [Radeon 7500]"
Monitor "Second Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
Screen 0 "Main Screen"
Screen 1 "Second Screen" LeftOf "Main Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
Option "Xinerama" true
EndSection

Section "DRI"
Mode 0666
EndSection

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Re: Dual Head (two monitors, one card) not working

Submitted by Matt on Thu, 2008-02-21 22:11.

I can't see anything obviously wrong. Have you checked /var/log/Xorg.0.log for errors?

»

Re: Dual Head (two monitors, one card) not working

Submitted by djinn on Fri, 2008-02-22 04:10.

Thanks - I think I see it there's a file called Xorg.0.log.old and it points out that I should have
Option "Xinerama" "true"
not Option "Xinerama" true
I'll give it another go - Thanks again.

»

Re: Dual Head (two monitors, one card) not working

Submitted by djinn on Sun, 2008-03-02 04:24.

That fixed the problem. Most programs work fine with the two screens - only the gThumb ran into trouble doing full screen - it was quite tricky to get out of - the menus kept popping up on the other screen and then disappearing ...
But Xinerama seems to work fine, including hibernating and re-starting.
Thanks

»
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