Bug#971017: linux: Select INTEL_PMC_CORE to include Intel PMC Core driver

[Paul Menzel <pmenzel@molgen.mpg.de>]

Dear Debian folks,


Am 26.09.20 um 10:57 schrieb Paul Menzel:
> Package: src:linux
> Version: 5.8.10-1
> Severity: normal

[…]

> Currently, certain information regarding the Intel Power Management 
> Controller is unaccessible, as the driver is not packaged by the Debian 
> Linux kernel.
>
>      $ grep INTEL_PMC_CORE /boot/config-5.8.0-2-amd64
>      # CONFIG_INTEL_PMC_CORE is not set
>
> This makes it harder to analyze, how power management works, why it 
> often does not, like for example, why package C-State C10 is not reached 
> on the Dell Latitude E7250.
>
> It’d be great, if you selected `INTEL_PMC_CORE` in the configuration to 
> build the driver.
>
> > config INTEL_PMC_CORE
> >         tristate "Intel PMC Core driver"
> >         depends on PCI
> >         help
> >           The Intel Platform Controller Hub for Intel Core SoCs 
> > provides access
> >           to Power Management Controller registers via a PCI 
> > interface. This
> >           driver can utilize debugging capabilities and supported 
> > features as
> >           exposed by the Power Management Controller.
> >
> >           Supported features:
> >                 - SLP_S0_RESIDENCY counter
> >                 - PCH IP Power Gating status
> >                 - LTR Ignore
> >                 - MPHY/PLL gating status (Sunrisepoint PCH only)

Ubuntu ships with

    /boot/config-5.4.0-48-generic:CONFIG_INTEL_PMC_CORE=y

but I do not know, why it’s not built as a module.


Kind regards,

Paul