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Subject: [Bug 233764] [amdtemp] does not recognize AMD A8-7600 temperature
sensors
Date: Fri, 07 Dec 2018 19:35:16 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D233764
Conrad Meyer <cem@freebsd.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|11.2-STABLE |CURRENT
--- Comment #12 from Conrad Meyer <cem@freebsd.org> ---
(In reply to gosha-necr from comment #11)
It seems like probably the HDD temperature can be inferred to be a floor. =
The
CPU is unlikely to be cooler.
As far as diagnosing, I am kind of stuck. Maybe these CPUs run with Tctl at
some offset. But I don't know what the offset is. One more PCI read for y=
ou:
pciconf -r pci0:0:24:3 0x64
This is "Hardware Thermal Control" and bits [22:16] tell us the "HtcTmpLimi=
t."
As the BKDG notes, the CurTmp value does not reflect an actual temperature,=
but
rather:
> Tctl is a temperature on its own scale aligned to the processors cooling
> requirements. Therefore Tctl does not represent a temperature which coul=
d be
> measured on the die or the case of the processor. Instead, it specifies t=
he
> processor temperature relative to the maximum operating temperature, Tctl=
,max.
> Tctl,max is specified in the power and thermal data sheet.
So maybe there is some relationship between Tctl,max and HtcTmpLimit. Or m=
aybe
we can find a power and thermal data sheet for 15h and find the correct off=
sets
for A8-7600 / FX-8300.
I bumped bug version to "CURRENT" because I don't believe there are any
significant differences between amdtemp on 15h in 11.2 and on CURRENT.
--=20
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