linux-kernel - RE: stable: commit "cpuidle: menu: Avoid discarding useful information" causes regressions

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Message-ID: <001601dc3ddd$a19f9850$e4dec8f0$@telus.net>
Date: Wed, 15 Oct 2025 07:11:41 -0700
From: "Doug Smythies" <dsmythies@...us.net>
To: "'Sergey Senozhatsky'" <senozhatsky@...omium.org>
Cc: "'Rafael J. Wysocki'" <rafael@...nel.org>,
	"'Christian Loehle'" <christian.loehle@....com>,
	"'Rafael J. Wysocki'" <rafael.j.wysocki@...el.com>,
	"'Greg Kroah-Hartman'" <gregkh@...uxfoundation.org>,
	"'Artem Bityutskiy'" <artem.bityutskiy@...ux.intel.com>,
	"'Sasha Levin'" <sashal@...nel.org>,
	"'Daniel Lezcano'" <daniel.lezcano@...aro.org>,
	<linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	"'Tomasz Figa'" <tfiga@...omium.org>,
	<stable@...r.kernel.org>,
	"Doug Smythies" <dsmythies@...us.net>
Subject: RE: stable: commit "cpuidle: menu: Avoid discarding useful information" causes regressions

On 2025.10.14 21:50 Sergey Senozhatsky wrote:
> On (25/10/14 20:41), Doug Smythies wrote:
>> What thermal limiting methods are being used? Is idle injection being used? Or CPU frequency limiting or both.
>
> How do I find out?

>From the turbostat data you do not appear to be using the TCC offset method. This line:

cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x0f690080 (105 C)

whereas on my test computer, using the TCC offset method, shows:

 cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x14641422 (80 C) (100 default - 20 offset)

To check if thermal is being used do:

systemctl status thermal

Example:

doug@s19:~/idle/teo/menu2$ systemctl status thermald
○ thermald.service - Thermal Daemon Service
     Loaded: loaded (/usr/lib/systemd/system/thermald.service; disabled; preset: enabled)
     Active: inactive (dead)

If something else is being used, I don't know.

... Doug