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

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Message-ID: <88ffb216-96f9-f232-7fe5-48bf82e6aa70@gmail.com>
Date:   Wed, 30 Aug 2023 08:11:06 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     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>,
        Brett Hassall <brett.hassall@...il.com>
Cc:     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: Fwd: upstream linux cannot achieve package C8 power saving

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
View attachment "proposed.patch" of type "text/x-patch" (3661 bytes)