Your dmesg contains that:
[ 8849.688210] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed to
train DP, aborting
[ 9438.466017] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed to
train DP, aborting
[ 9464.436928] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed to
train DP, aborting
Did you file the bug report right after this failure, i. e. is this
current information?
Can you reproduce this with "sudo apt-get install --reinstall systemd"?
If so, that's most probably fallout from bug 1431200; this is just about
the only (indirect) way how systemd touches graphics, so if that doesn't
reproduce it, this is a kernel bug. Thanks!
** Changed in: systemd (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1438306
Title:
External monitors receive no signal
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