[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 #30 from Pedro (voidpointertonull+kernelorgbugzilla@gmail.com) ---
(In reply to Mario Limonciello (AMD) from comment #23)
> 6.7-rc4 was /supposed/ to fix the kind of bug that Pedro described.  See
> this commit.
> https://github.com/torvalds/linux/commit/
> febab20caebac959fdc3d7520bc52de8b1184455
> 
> There must be another problem though; I wonder if something isn't getting
> flushed out still.

Figured that was for getting the functionality working at all.
There are only 3 relevant commits in 2 days, and one from that is only a visual
change. Before those the functionality simply just didn't work at all, and
after those apparently the silly behavior described is easy to reproduce.

(In reply to AlexDeLorenzo.dev from comment #29)
> It happened again ~90min after doing a `systemctl kexec` and using
> `ryzenadj`, so I can better answer your questions.

Apparently ryzenadj directly communicates with the SMU without using an in-tree
kernel module to use an interface blessed by AMD, so that's highly unlikely to
get support from them.

Recommending reproducing the issue without using that at all first, it's going
to keep on getting the blame until it's proven not to interfere.

Do you happen to know such tools for Raphael (7000 series, Zen 4 based
desktop)?
Investigating silly memory and/or IMC issues, was happy to see ryzen_smu
reporting a whole lot of relevant info, but then it turned out to be abandoned,
and forks claiming to support Raphael don't seem to target my root complex
(PCI_DEVICE_ID_AMD_19H_M60H_ROOT).
Worst case I'll make a Windows setup and check the tools there, just hoped to
be able to avoid that. I hate BIOS "Auto" settings with a passion not even
showing current values, and the CPU's memory controller seems to be quite
finicky.

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