Oh wait -- you are saying that the external monitor does not receive a
signal at any point in time? I thought the external monitor would stop
working *during/after* running dist-upgrade, and start working again
after a reboot.
That sounds like a kernel/video driver/X.org regression then,
reassigning.
** Package changed: systemd (Ubuntu) => xorg (Ubuntu)
** Changed in: xorg (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1438306
Title:
External monitors receive no signal over DisplayPort
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