Thanks for the bug report.
Most intermittent black screen flickers are caused by a loss of display
signal integrity. It's especially common at high resolutions or refresh
rates (I notice you're using 4K). That can usually be fixed by replacing
the display cable and/or taking the dock out of the equation. So three
things to try:
1. A new (higher grade) cable.
2. Another new cable that bypasses the dock (USB-C to DisplayPort or
whatever you need).
3. Next time the problem happens, immediately run this command:
journalctl -b0 > journal.txt
and attach the resulting text file here, in case something relevant
is being logged.
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: multimonitor
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https://bugs.launchpad.net/bugs/2076264
Title:
Secondary external display intermittently goes black
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