Background information: the main problem is the nvidia driver.  I have also 
freezes at boot with the last line stating ACPI: Video Device ....   
Unfortunately with this hardware I cannot use builtin  Intel GPU because it 
does not drive any of external video ports.
I have two 3K monitors connected over docking stations DPorts , lid is closed. 

I tried all 3 version of nvidia binary driver available through packet manager, 
none works properly in context of suspend/hibernation.
Suspend/Hibernation never worked reliably. I have managed a few times to wake 
the system from hibernation, but it was very rare.

As this issue being fixed is very important to me, let me know how can I
help further.  I would be glad to test any hint or workaround you
provide.

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https://bugs.launchpad.net/bugs/1429622

Title:
  [LENOVO 2447MU0] suspend/resume failure [non-free: nvidia]

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