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I know, yet another post of ACPI.sys sitting atop a CPU core. It's seems a different issue from the other posts, though, please, read on. The other proposed solutions didn't work!

  • It's a P65_67RSRP notebook, i7-6700HQ processor, Windows 10 64-bit version 1903.

  • Also, it seems to be a OS-agnostic issue, as it manifested itself also under the installed Manjaro KDE, with process kworker/0:2+kacpid using ~11% CPU!

  • I was able to fix the issue under Linux by disabling interrupt gpe6F (as suggested here: https://forum.manjaro.org/t/kworker-kacpid-cpu-100/131532)

  • The problem is that I don't know how to reproduce this fix in Windows!

  • It seemingly started after I installed a NVMe SSD from Intel alongside the other disks.** The new device model: INTEL SSDPEKNW010T8. So, the computer now has a 240GB PCI-e SSD (disk 0), a HDD (disk 1) and the NVMe (disk 2).

  • Nothing worked: No solution proposed in https://superuser.com/a/1164299/511946 worked. I've tried installing Intel drivers for the SSD to no avail. Disabling power management options didn't work for any device, network card included. No BIOS updates are due.

  • I investigated until I reached ACPI.sys as the culprit. I tracked the callstack with MPT and found this:

enter image description here

This image, the fix in Linux and the new SSD are certainly clues, but I can't figure them out.

Any tips debugging this?

Fernando D'Andrea
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1 Answers1

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Some possibilities:

  • In Power Options > Change plan settings, click "Restore default settings for this plan" and reboot
  • Disable the PCI Express Link State Power Management as described in this article and reboot
  • Boot in Safe mode and if it doesn't happen then some installed application is responsible for the problem
  • The post Why is the System process using 40-60% of CPU power all the time might also be of help.
harrymc
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