most solutions failed here, however:

changing the last part in /usr/lib/pm-utils/sleep.d/55NetworkManager

from
  thaw|resume)¶
     resume_nm¶

to
  thaw|resume)¶
    resume_nm¶
    sleep 2 && iwlist eth1 scanning &

forces a wifi scan and network manager connects almost immediately after
resume.

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https://bugs.launchpad.net/bugs/274405

Title:
  network manager slow to reconnect after suspend/resume

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