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Subject: [Bug 218264] [amdtemp] does not recognize AMD Ryzen/Chipset
 temperature sensors
Date: Fri, 01 Sep 2017 23:11:41 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D218264

--- Comment #5 from Conrad Meyer <cem@freebsd.org> ---
(In reply to Nils Beyer from comment #1)
This is amusing, but for context I have a similar nct sensor on my Intel sy=
stem
and it doesn't track the core temperatures at all.

At idle, it reports about 8=C2=B0C cooler than the package/core sensors.

Under load, it climbs more slowly and reaches a peak ~30=C2=B0C below the
package/core sensors.

Back to idle, it starts falling again while the cores still report 10=C2=B0=
C higher.

So I don't think this sensor is sufficient even if we integrated it better.

Fortunately, I was able to find the AMD SB-TSI (sideband temperature sensor)
spec which supposedly documents communication with the CPU temperature sens=
or
over SMBus.

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