I tested v4.7-rc7, specifically this deb:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc7/linux-image-4.7.0-040700rc7-generic_4.7.0-040700rc7.201607110032_amd64.deb

It does not fix the problem, so I will be adding the kernel-bug-exists-upstream 
tags as you requested. The ACPI error messages have changed to reflect a newer 
version:
ACPI Error: Method reached maximum reentrancy limit (255) 
(20160422/dsmethod-340)

FWIW, I haven't found it necessary to install linux-header debs since
the generic kernels support all the hardware on this machine and I don't
need to compile any third party modules.

I have also found that if the machine is idle, there's a pause in the
"ACPI Error" messages. I think it depends on how much writing to disk is
going on, but that's just a gut feeling. I'm not quite sure how to
verify that assumption, or if it would help diagnose the problem.

** Tags added: kernel-bug-exists-upstream kernel-bug-exists-
upstream-4.7-rc7

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1603230

Title:
  acpi regression first bad commit
  02b771b64b73226052d6e731a0987db3b47281e9

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