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Suspend-then-hibernate does not work on Mint 17.3 Cinnamon

Dear all

I am hoping to get some help with the following problem.

I'm trying to get my laptop (Mint 17.3 x64 Cinnamon, Dell D830) to hibernate automatically after it's been in suspend for a while. I have tried various proposals and they don't work (namely, ideas here and here) and they don't work.

I have kernel 4.2.0-25. My system works well in other respects (including suspend and hibernate). Also, the code

Code:

sudo pm-is-supported --suspend-hybrid && echo "hybrid suspend is supported" || echo "your system doesn't support hybrid suspend"

reports that 'hybrid suspend' is available on my system.

hibernate requires active swap space at least the size of your physical ram.
do you have that?
(type "free" to find out)

@ondoho

Yes, I have sufficient swap space - hibernation works fine. It is suspend to hibernate (i.e. hiberbate after a certain period of being suspended) that I am having trouble with.