Thank you for reporting this bug and helping to make Ubuntu better. Can
you please provide the output of the following command:
$ lspci -nnk | grep -A2 VGA
It should say that the video card is using nvidia (closed source,
proprietary binary) and not nouveau (free open source). Most advanced
features (such as display port) do not work properly under noueau
driver. To install the nvidia driver simply go to System >
Administration > Hardware Drivers and enables the proposed/suggested
driver for your video card.
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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External display through display port not working
https://bugs.launchpad.net/bugs/636903
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