One further historical detail: when these machines were running 14.04.3
and we made the mistake of accepting the HardWare Enablement (HWE)

which replaced the old fglrx driver with the radeon one, that's when we
first encountered this unable-to-unblank problem.

Fortunately, at that time we were able to roll back Xorg to 1.16 and
keep things sort-of working:

When we performed a clean, full re-install with 16.04 we were hoping
this problem would be resolved, but as I've documented here it continues
to affect the systems.

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  kernel panic in Radeon driver while screen blank

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