Ok, so, for what its worth, here is my current summary:
 - I already have `ubuntu-drivers-common` `1:0.9.7.6ubuntu3.1` installed since 
a few days, and it did not help resolve the problem.
 - I have reduced the monitor resolution, and this reliably circumvents the 
problem (no more issues since 24h)

I will try with a more modern HDMI cable next, to see if that helps!

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https://bugs.launchpad.net/bugs/2075525

Title:
  After screen blank, the displays configuration gets lost

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