Hi Alex. I tried your advice with my Eth adapter attached then detached, both 
with XHC enabled or disabled, but the laptop can't sleep.
I didn't try booting with the external device attached. I see in my BIOS 
(latest available A10 rev. from oct. 2013) there are some USB related 
parameters that I cannot understand all or consequences:
USB Emulation: (Enabled) If enabled, defines how the BIOS controls USB devices.
USB Powershare: (Enabled) If enabled, external devices can be charged even when 
the computer is turned off.
USB Wake Support: (Disabled) If enabled, USB devices can be configured to wake 
the computer from Standby.
...
External USB Ports: (Enabled) Allows you to enable or disable external USB 
ports.
USB Debug: (Disabled)

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https://bugs.launchpad.net/bugs/1887564

Title:
  Laptop XPS13 can't sleep Ubuntu 16.04.6 LTS when USB3 device is/was
  attached.

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