[Bug 218686] Fail to set energy_performance_preference of amd processor on asus ga403uv

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218686

--- Comment #66 from Mike (mike.stokes85@gmail.com) ---
(In reply to xiaojian.du from comment #62)
> (In reply to Chema from comment #61)
> > (In reply to Chema from comment #60)
> > > I have the same laptop and also the command outputs are the same.
> > > 
> > > I have updated last week to the last BIOS version, but no changes I have
> > > seen.
> > > 
> > > Is there any updates to this?
> > 
> > Also, if CPPC is working in windows why it cant in linux?
> 
> Not exactly.
> 
> How to check CPPC is used or not on *Windows OS*:
>     *check Windows Logs -> System, look for "Kernel-Processor-Power" or
> event ID 55.
>        ->>If you find ACPI Collaborative Processor Performance Control,
>            then Windows is using CPPC.
>        ->>If you find ACPI Performance (P) / Throttle (T) State,
>            then it is using legacy P-states, and CPPC is disabled.

I Can confirm on G14 GA304UV that CPPC is enabled under windows, but not Linux:


Processor 0 in group 0 exposes the following power management capabilities:

Idle state type: ACPI Idle (LPI) States (3 state(s))

Performance state type: ACPI Collaborative Processor Performance Control
Nominal Frequency (MHz): 4001
Maximum performance percentage: 139
Minimum performance percentage: 27
Minimum throttle percentage: 10

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