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Current reports from `sensors` for Zen 3 CPUs:
```
PCH_CHIP_CPU_MAX_TEMP:      +0.0°C  
PCH_CHIP_TEMP:              +0.0°C  
PCH_CPU_TEMP:               +0.0°C 
```

This bug is due to the lack of Zen 3 support in Ubuntu's implementation
of k10temp.

Zen 3 (Ryzen 5XXX) temperature support is now ready as a part of
`k10temp`: https://www.kernel.org/doc/html/latest/hwmon/k10temp.html and
narrowly missed the window for mainline kernel 5.12. My understanding is
it was included in 5.10, removed in 5.11 for documentation/validation
reasons, then planned again after updates.

With the popularity of these chips increasing, having accurate CPU temp
readings is of import in Ubuntu 20.04, as this is an LTS release with
support until 2025. Therefore, as we are set at kernel 5.8 at the
moment, with 21.04 releasing with kernel 5.11, it may be worth pulling
in the latest k10temp to fix this bug as to not delay access to vital
CPU information throughout 2020.

Thanks.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
Zen 3 (Ryzen 5XXX) temperatures not reported by k10temp
https://bugs.launchpad.net/bugs/1918065
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