Public bug reported:

I have been struggling to find out how to get my laptop (Dell M3800)
using ubuntu 16.04 to resume from suspend. It goes into suspend (with no
errors in /var/log/pm-suspend.log). But when resuming, it immediately
reboots, with no errors in /var/log/pm-suspend either.

*but*

Resume works perfectly when a USB key is plugged in (any key!).

PS: I figured that out because suspend/resume works out of the box when
using ubuntu 16.04 live CD, but not when using the fresh installed 16.04
afterwards. What's the difference?? There's a key in the USB port in the
first case. So I tried suspend/resume with the *installed* version when
a USB key is present: it works.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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https://bugs.launchpad.net/bugs/1617599

Title:
  Resume from suspend causes reboot, except if USB key is plugged in

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