In case it helps (which I doubt, this would be too simple), I restored
wakeup after suspend by downgrading intel-microcode 3.20180425.1 to
previous version 2.20140122.1

I found it by listing/examining the updates made to the system in days
preceding the malfunction, a possibility I didn't find in synaptic or
software center (they seem to care only about their own activity). I
sorted down possible culprits to procps (and a dependency) or intel-
microcode (and iu-tools from backports, which was listed as modified the
same day but not updated, strangely). Turns out procps wasn't
responsible (for me).

HTH (with doubts).

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https://bugs.launchpad.net/bugs/1774150

Title:
  3.13.0-149-generic: suspend/resume issue on 14.04

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