The problem has mysteriously resolved itself.
I updated once again yesterday via Software Updater (for good measure).
I haven't changed any settings; kernel is still 4.4. Based on some
Googling it seems the problem might have been related to some part of my
system which is hallucinating mid-sleep
Public bug reported:
My Dell Precision 5510 laptop has recent drivers for graphics. I
installed a lot of updates this week, and I have been finding that the
laptop shuts down in the "Suspend" state if at any point AC power is
unplugged.
Steps to reproduce:
1. With laptop plugged in to AC power an
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