linux-kernel - Re: upstream linux cannot achieve package C8 power saving

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Message-ID: <CANiJ1U_eysXU+i+7w6O7f7t5d4kfyT+yM=NbMH82YOLpaaDmJg@mail.gmail.com>
Date:   Thu, 31 Aug 2023 06:46:47 +1000
From:   brett hassall <brett.hassall@...il.com>
To:     Bagas Sanjaya <bagasdotme@...il.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        "Maciej W. Rozycki" <macro@...am.me.uk>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Ajay Agarwal <ajayagarwal@...gle.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Vidya Sagar <vidyas@...dia.com>,
        Michael Bottini <michael.a.bottini@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux Power Management <linux-pm@...r.kernel.org>
Subject: Re: upstream linux cannot achieve package C8 power saving

Hi

Ok, I will read into working up a formal patch.

Thanks for the reply.

Brett


On Wed, 30 Aug 2023 at 11:11, Bagas Sanjaya <bagasdotme@...il.com> wrote:
>
> Hi,
>
> I notice a bug report on Bugzilla [1]. Quoting from it:
>
> > v6.5 (and at least v5.15, v5.19 and v6.4 as well) will not go to a higher power saving level than package C3.
> >
> > With the inclusion of a patch that combines 3 Ubuntu commits related to VMD ASPM & LTR, package C8 is used.
>
> See Bugzilla for the full thread.
>
> FYI, the attached proposed fix is the same as Brett's another BZ report [2].
> I include it for upstreaming.
>
> To Brett: Would you like to submit the proper, formal patch (see
> Documentation/process/submitting-patches.rst for details)?
>
> Thanks.
>
> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=217841
> [2]: https://bugzilla.kernel.org/show_bug.cgi?id=217828
>
> --
> An old man doll... just what I always wanted! - Clara