[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 #68 from Chema (chemasanchezgarabito@gmail.com) ---
(In reply to Perry Yuan(AMD) from comment #67)
> https://www.amd.com/content/dam/amd/en/documents/processor-tech-docs/
> programmer-references/55901_B1_pub_053.zip 
> 
> Page 120.
> 
> CPUID_Fn80000008_EBX [Extended Feature Extensions ID EBX]  
> Bit 27 CPPC. Read-only. Reset: 1. Collaborative Processor Performance
> Control.
> 
> sudo cpuid -l 0x80000008 -r
> CPU 0:
>    0x80000008 0x00: eax=0x00003030 ebx=0x111ef257 ecx=0x0000400f
> edx=0x00010000
> 
> Bit 27 = 0, that means BIOS didn`t enable CPPC capability, OS cannot detect
> the CPPC flag on the system, 
> 
> you can check lscpu output,
> 
> #lscpu |grep cppc.
> 
> Windows maybe don`t depends on this CPUID bit, but Linux detect the CPUID
> and set cppc flag at kernel booting. no cppc flag, amd-pstate driver cannot
> load so far.

Ok, I understand, so ASUS is not doing it in the standard way.

I have contacted  them and I am waiting for a response, but being more should
bring more attention, I don't know if you Perry could do something special to
contact them an press them in some way, as I am aware that they only support
windows officially, I (and I think all of use in this thread) would be very
thankful to you.

Also in the case that they didn't want to make the change, what solution we
could potentially create, I have done system development a few times, I don't
know if it is possible to create some kind of driver of module for the kernel
that modified this behaviour.

Also, if all the others in this thread with the same problem could contact ASUS
to write a ticket, may catch their attention to this matter.

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