Re: [Regression] 6.11.0-rc1: AMD CPU boot with error when CPPC feature disabled by BIOS

[Xiaojian Du]

On 2024/7/31 11:39, David Wang wrote:
> At 2024-07-31 11:16:14, "Xiaojian Du" <xiaojidu@xxxxxxx> wrote:
> > On 2024/7/31 8:25, David Wang wrote:
> > > Hi Du,
> > >
> > > Thanks for the quick response
> > >
> > > ...
> > > I feel that you are arguing for the warning and the errors separately.
> > > Separately,   I agree warning or error message make sense as you explained,  but together I feel confused:
> > > Receiving a warning that CPPC feature is disable by BIOS already notify users that amd-pstate would not work, right?
Warning is not enough, error will guide user to switch to acpi cpu 
driver or seek more support from OEM.
> > > Is it possible, that those two condition coexists: CPPC is disabled by BIOS, and  amd-pstate could function properly?
> > >
> > >   

No possible, the current amd-pstate driver is based on CPPC feature.

Thanks.
Xiaojian

> > > Thanks
> > > David