Yes, I've tested a few days ago and I believe the same behavior appears
: no really sleep mode, battery in discharge. Just the screen black.

But I've non tested with 
$ sudo sh -c 'echo mem > /sys/power/state'
$ sudo sh -c 'echo deep > /sys/power/mem_sleep'

I don't know the default value of this two files and it seems the kernel
memories them.

Sorry for my English

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https://bugs.launchpad.net/bugs/1810619

Title:
  Sleep mode doesn't work

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