Regarding the "bios-outdated" tag: I did a BIOS update, it now is
BIOS Information
Vendor: LENOVO
Version: JBET60WW (1.24 )
Release Date: 05/25/2016
but the problem persists.
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https://bugs.launchpad.net/bugs/1604313
Title:
Ubuntu 16.04: system freezes instead of suspend after undocking
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