No, should look something like this: (Adjust for your own values)
Section "Screen"
Identifier "Default Screen"
Device "Configured Video Device"
DefaultDepth 24
SubSection "Display"
Depth 24
Virtual 3840 1200
EndSubSection
EndSection
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[R520] xserver-xorg-video-ati 6.9.0 causes blank screen on r500
https://bugs.launchpad.net/bugs/252383
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