In case this proves useful, the following works for me:
Section "ServerFlags"
Option "DontZap" "false"
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "DELL U2410"
DefaultDepth 24
SubSection "Display"
Depth 24
Virtual 3200 2000
Modes "1900x1200" "1600x1200" "1280x1024" "1152x864" "1024x768" "800x600" "720x400" "640x480"
EndSubSection
EndSection
Section "Module"
Load "glx"
EndSection
Section "Device"
Identifier "Default Device"
Driver "fglrx"
EndSection
It seems like the proprietary driver (and not using the built-in Intel card) is necessary on my laptop. However, go-go-gadget Display Port.
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