[Bug 217931] amd-pstate lacks crucial features: CPU frequency and boost control

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217931

--- Comment #14 from Pedro (voidpointertonull+kernelorgbugzilla@gmail.com) ---
Got back to a more recent kernel and found out that apparently the issue is
sillier than expected.
It's not the first change that's failing, but when setting a new frequency
limit, the previous limit gets applied instead.

So for example after a fresh boot:
- Set 4.0 GHz -> Nothing changes
- Set 4.5 GHz -> 4.0 GHz limit gets applied
- Set 4.3 GHz -> 4.5 GHz limit gets applied
- Set 4.3 GHz -> Nothing changes because it's already supposed to be 4.3 GHz
- Set 4.2 GHz -> 4.3 GHz limit gets applied

Way better than nothing, but it's surely odd this way.
Good to know its quirk though, earlier I just thought it was simply not really
reliable, but explicitly working around its silly issue makes it useful.

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