From: Greg KH <gregkh@linuxfoundation.org>
To: "Limonciello, Mario" <Mario.Limonciello@amd.com>
Cc: "stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: Fix issues caused by lack of x86 LPI support
Date: Thu, 14 Apr 2022 12:56:38 +0200 [thread overview]
Message-ID: <Ylf95jt6GSjbJeO+@kroah.com> (raw)
In-Reply-To: <BL1PR12MB515758FA1BFA7C94812B88A3E2ED9@BL1PR12MB5157.namprd12.prod.outlook.com>
On Tue, Apr 12, 2022 at 10:09:30PM +0000, Limonciello, Mario wrote:
> [Public]
>
> Hi,
>
> There are a variety of x86 systems that advertise LPI support and as part of negotiation with firmware they don't end up using C-states
> in certain circumstances. This leads to higher runtime power consumption and also failure to enter s2idle.
>
> In mainline there have been changes to block that behavior. Can you please backport these two commits from mainline?
> commit 01f6c7338ce267959975da65d86ba34f44d54220 ("cpuidle: PSCI: Move the `has_lpi` check to the beginning of the function")
> commit eb087f305919ee8169ad65665610313e74260463 ("ACPI: processor idle: Check for architectural support for LPI")
>
> This should go to 5.15.y and later stable kernels.
Queued for 5.4 and newer kernels. If you want this backported to older
ones, please provide a working set of patches.
thanks,
greg k-h
prev parent reply other threads:[~2022-04-14 10:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-12 22:09 Fix issues caused by lack of x86 LPI support Limonciello, Mario
2022-04-14 10:56 ` Greg KH [this message]
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