[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 #36 from AlexDeLorenzo.dev (alex.delorenzo@gmail.com) ---
(In reply to Pedro from comment #30)
> 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.

So I shutdown the PC and started it, disabled any scripts that might trigger
`ryzenadj` beforehand. There were no suspend/resume cycles since booting.

About 4 hours later, the CPU was stuck at 400MHz.


(In reply to Mario Limonciello (AMD) from comment #32)
> As I mentioned in the other issue, to rule out a kernel bug we may want to
> look at the output of these MSRs while the issue happened.  If those are
> correct for what has been programmed to scaling_max_freq, then we may be
> dealing with a firmware bug.
> 
> #define MSR_AMD_CPPC_CAP1             0xc00102b0
> #define MSR_AMD_CPPC_ENABLE           0xc00102b1
> #define MSR_AMD_CPPC_CAP2             0xc00102b2
> #define MSR_AMD_CPPC_REQ              0xc00102b3
> #define MSR_AMD_CPPC_STATUS           0xc00102b4

MSRs before:

    0xc00102b0:  ba46290fba46290f
    0xc00102b1:  1
    0xc00102b2:  0
    0xc00102b3:  a6a6
    0xc00102b4:  0

MSRs while forced underclock:

    0xc00102b0:  ba46290fba46290f
    0xc00102b1:  1
    0xc00102b2:  0
    0xc00102b3:  e0e
    0xc00102b4:  0


(In reply to Mario Limonciello (AMD) from comment #34)
> Can you guys please test this:
> 
> https://lore.kernel.org/linux-pm/20240119113319.54158-1-mario.
> limonciello@amd.com/T/#u

I'll give this a go.

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