I see the same behaviour on a 16.04 desktop with a Nvidia 970.

Before this I was successfully suspending many times per session using
14.04 with a Wily HWE stack so I think that excludes 4.2 from directly
being the problem. I have since disabled timed suspend but if the
monitor has been turned off (via DPMS),  first-time manual suspend
fails.

The 16.04 Live image also suspends fine. That uses Nouveau though.

So I think the common factor between us is the proprietary Nvidia driver
and Maxwell (we're on different generations but, still). I've tried
versions 358 and 364 of the driver but both are broken for me on 16.04.

Unfortunately I upgraded to my 970 (from a 580) about the same time I
upgraded to 16.04 so I can't rule out it being just a Maxwell issue.

You get anywhere with this?

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https://bugs.launchpad.net/bugs/1552216

Title:
  Laptop hangs during second time it suspends

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