dear Lars,

On Mon, 23 Jan 2017, Lars Noodén wrote:

on my X220 running Debian Jessie with Linux kernel 4.7.0-0.bpo.1-amd64
from backports, suspend to memory succesfully works using:

sudo pm-suspend

actually it worked also on the stock kernel version 3.*

the dmesg log sequence after a sleep and wakeup (pressing any keys)

PM: Syncing filesystems ... done.
PM: Preparing system for sleep (mem)
PM: Suspending system (mem)
PM: suspend of devices complete after 752.838 msecs
PM: late suspend of devices complete after 16.180 msecs
PM: noirq suspend of devices complete after 16.110 msecs
PM: Saving platform NVS memory
PM: Restoring platform NVS memory
PM: noirq resume of devices complete after 17.645 msecs
PM: early resume of devices complete after 0.391 msecs
PM: resume of devices complete after 1184.715 msecs
PM: Finishing wakeup.

the fact powerdown and shutdown don't work from the windowmanager is
known. I suspect the fork curated by Dima here may provide a solution
https://git.devuan.org/dimkr/xfce4-power-manager



ciao