linux-kernel - Re: [Regression] 6.11.0-rc1: AMD CPU boot with error when CPPC feature disabled by BIOS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87zfpxsweb.fsf@BLR-5CG11610CF.amd.com>
Date: Wed, 31 Jul 2024 15:42:12 +0530
From: Gautham R.Shenoy <gautham.shenoy@....com>
To: David Wang <00107082@....com>, <perry.yuan@....com>
CC: <Alexander.Deucher@....com>, <Li.Meng@....com>,
	<Mario.Limonciello@....com>, <Xiaojian.Du@....com>, <Xinmei.Huang@....com>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<rafael.j.wysocki@...el.com>, <viresh.kumar@...aro.org>, <00107082@....com>
Subject: Re: [Regression] 6.11.0-rc1: AMD CPU boot with error when CPPC
 feature disabled by BIOS

Hello David,

David Wang <00107082@....com> writes:

> Hi,
>
> I notice some kernel warning and errors when I update to 6.11.0-rc1:
>
>  kernel: [    1.022739] amd_pstate: The CPPC feature is supported but currently disabled by the BIOS.
>  kernel: [    1.022739] Please enable it if your BIOS has the CPPC option.
>  kernel: [    1.098054] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>  kernel: [    1.110058] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>  kernel: [    1.122057] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>  kernel: [    1.134062] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>  kernel: [    1.134641] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>  kernel: [    1.135128] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>  kernel: [    1.135693] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>  kernel: [    1.136371] amd_pstate: min_freq(0) or max_freq(0) or nominal_freq(0) value is incorrect
>  kernel: [    1.136390] amd_pstate: failed to register with return -19
>  kernel: [    1.138410] ledtrig-cpu: registered to indicate activity on CPUs
>
>
> Those warning message was introduced by commit:
>  bff7d13c190ad98cf4f877189b022c75df4cb383 ("cpufreq: amd-pstate: add debug message while CPPC is supported and disabled by SBIOS)
> , which make sense.


If CPPC is disabed in the BIOS, then the _CPC objects shouldn't have
been created. And the error message that you should have seen is
"the _CPC object is not present in SBIOS or ACPI disabled".


Could you please share the family and model number of the platform where
you are observing this ?

--
Thanks and Regards
gautham.