Thanks for including the necessary files.
Have you also tried booting with no xorg.conf, and using the Screen
Resolution tool to activate your external monitor?
** Changed in: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided => High
Status: New => Triaged
** Also affects: xserver-xorg-driver-ati
Importance: Undecided
Status: New
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ati driver will not turn on external display
https://bugs.launchpad.net/bugs/231081
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