It would be more useful to get some logs with the device already
connected, but I'm seeing in the logs:

[    5.126206] [Firmware Bug]: Duplicate ACPI video bus devices for the
same VGA controller, please try module parameter
"video.allow_duplicates=1"if the current driver doesn't work.

Maybe try booting with video.allow_duplicates=1 added to the kernel
command line?

** Changed in: xorg (Ubuntu)
       Status: New => Invalid

** Changed in: xorg (Ubuntu)
       Status: Invalid => Incomplete

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https://bugs.launchpad.net/bugs/1325661

Title:
  second monitor problems

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