Just wanted to share my observations.

At least on my machine, "failed resumes" are appearing in series after
initial BSOD (black screen of death), which usually occurs after a long
suspend.

After some experimentation, I've found that full/proper shut-down and
boot-up cycle (in addition to the forced power-down after the initial
BSOD) fixes the issue until next BSOD occurs.

My guess is something in kernel 4.15.xx triggers the BSOD and messes
suspend-resume parameters in EFI until it's re-set by the procedure
mentioned above.

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https://bugs.launchpad.net/bugs/1757445

Title:
  Suspend does not always resume

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