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Looks like I've got this one too on Lenovo P50 with E3-1505M. I've created #1759997 since I was not able to trace it immediately to this bug.
The problem is that I had a fully working system until 3.20180312.0 microcode update arrived - which made my system essentially unbootable. This was an unpleasant surprise and may be a wide spread problem since this microcode is now 'main stream'.