Comment 17 for bug 1552216

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?