[Bug 209202] [PATCH] [powermac_thermal] In-Kernel PowerMac fan control does not effectively regulate some quad core models

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209202

--- Comment #5 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Mark Millard from comment #4)

Such timing. . .

Looks like the single pump cooling system started dying as of a couple of days
ago (May 25).

Interesting oddities compared to my other exeriences:

A) The problem is intermittent.

B) While it is working normally the CPU diodes for CPU's B0 and B1 are the
cooler 2 of 4 according to sysctl results but it is B0 and/or B1 that start
getting readings in the 90+ degC range when it fails.

C) I've had complete buildworld's with no sign of the problem. Other times it
shuts down fairly soon after starting that or other much smaller builds. (6 or
more 90degC+ readings in a row initiates shutdown.)

Its boot drive is at -r298990 (as of May 5) and it was off from May 6 through
May 21 so it is not a great test of if the -r298990 update had a software
change that might be contributing.

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