Re: Kernel is using a lot of CPU
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Date: Tue, 31 Jan 2023 01:45:25 UTC
> 12.4 autoloaded acpi_wmi with dubious results: > > Autoloading module: acpi_wmi > acpi_wmi0: <ACPI-WMI mapping> on acpi0 > acpi_wmi0: cannot find EC device > device_attach: acpi_wmi0 attach returned 6 > acpi_wmi0: <ACPI-WMI mapping> on acpi0 > acpi_wmi0: cannot find EC device > device_attach: acpi_wmi0 attach returned 6 > > 12.2 did not autoload it. Ah, the EC. If it "cannot find" the EC, then that might account for unexpected strangeness. The EC is an "embedded controller" that is controlled by the ACPI and does certain kinds of strange things, for instance managing the battery. Some background information is here: https://queue.acm.org/blogposting.cfm?id=18995 If this is a usual elderly desktop connected to mains power, then you may not have it and/or not need it. On my desktop (ivybridge) I can safely do > devmatch_blacklist="acpi_wmi" On my rather modern Lifebook (tigerlake I think) I also get errors from it, but there I need it because otherwise some battery stuff is not done. In my case the error is "no response" and I did not experience unduly CPU load.