The difference under systemd is indeed mostly that the pm-utils suspend
quirks  are not being run any more, like /usr/lib/pm-
utils/sleep.d/60_wpa_supplicant . Does it help if you run

  sudo wpa_cli suspend

then suspend, resume, and run

  sudo wpa_cli resume

? If so, then we need to teach the wpasupplicant package to do that.
This part is most likely a duplicate of bug 1422143 then.

However (1) wpasupplicant certainly shouldn't segfault, and (2) things
like touchpad still being active during suspend is a kernel issue, so
this report is still legit (but should be kept for those issues, and the
wpasupplicant one should become separate).

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https://bugs.launchpad.net/bugs/1487919

Title:
  macbookrpro12,1 fails to suspend

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