Bug#985150: systemd-udevd is trying read from unused module acpi-cpufreq

Michael Biebl biebl at debian.org
Sat Mar 13 20:16:50 GMT 2021

Am 13.03.21 um 21:01 schrieb Anonimno:
> On Sat, 2021-03-13 at 20:42 +0100, Michael Biebl wrote:
>> Control: tags -1 + moreinfo
>> Am 13.03.2021 um 18:14 schrieb Anonimno:
>>> on almost every boot after some usage of my Thinkpad 470 with
>>> Buster
>>> installation and kernel 5.9 from backports following error message
>>> appears in
>>> the logs
>>> systemd-udevd[402]: could not read from
>>> '/sys/module/acpi_cpufreq/initstate':
>>> No such device.
>>> This laptop uses intel_pstate driver for frequency changes, so the
>>> error is not
>>> relevant?
>> Is this a question or bug report? If the latter, please provide a
>> bit
>> more details. I'm not sure what to do with it.
>> Michael
> Hi Michael,
> thank you for a fast response.
> The default Debian kernel from backports is using the built-in driver
> intel_pstate driver for Intel i5 CPU, so systemd-udevd should look for
> the frequency information there and not in the not used module
> acpi_cpufreq.

systemd-udevd does not care about the "frequency information".
Maybe the error message above is just a result of the (wrong) cpufreq 
driver being (auto)loaded. In which case, this is more likely to be a 
kernel issue.
As said, this bug is not really actionable without more information.

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