[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 #56 from Artem S. Tashkinov (aros@gmx.com) ---
Here's my report for 6.8.4 and Ryzen 7 7840HS:

1. Setting scaling_max_freq works, cool, but you cannot go below 544MHz. You
can set 400MHz but the CPU will continue to jump to 544MHz, not a big deal.

2. Setting scaling_min_freq sort of works, the CPU _prefers_ to stay at this
specified frequency but occasionally drops to 400MHz. Then, the CPU doesn't
totally respect it, i.e. for values below 1.4GHz it stays around 1397MHz. The
relationship is not linear, setting 4GHz results in the CPU preferring 3766Mhz.
Or 2GHz -> 1982MHz. Not a big deal. Unlikely anyone would want to set the
lowest frequency.

3. /sys/devices/system/cpu/amd_pstate/cpb_boost is missing altogether:

# find /sys -iname '*boost*'
[nothing]

So, my only remaining question is where's boost support? Or it's not supported
for all Zen CPUs?

Thanks a lot for your work regardless!

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