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

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Message-ID: <CANiJ1U9-2zfc5aJJUaYnTBTg+2vMjcfgsuxcFFnn+CjVQ1fCoA@mail.gmail.com>
Date:   Tue, 5 Sep 2023 06:25:55 +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

I contacted the Ubuntu developers to see if they were ok with using
their patches.

They advised the patches were outdated and further development was
under discussion.

The current patches work and would benefit Linux users until something
better comes along.

Would you like me to proceed with the formal patch still ?

Thanks
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