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Subject: [Bug 209202] [PATCH] [powermac_thermal] In-Kernel PowerMac fan
 control does not effectively regulate some quad core models
Date: Fri, 27 May 2016 22:38:24 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D209202

--- Comment #5 from Mark Millard <markmi@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 d=
ays
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 throu=
gh
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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