Hello,
Please keep me in Cc when you answer as I am not subscribed to the list.
I use the most current kernel 5.4.1 (but I did have that problem since several 5.x versions) on gentoo on a X61s Lenovo laptop. What I see is that from time to time one CPU is constantly working and draining my battery with a process kworker/*-events.
Today I was able to identify the source of the problem. The module snd-hda-intel seems to produce that load. When I unload the module, the CPU hook is gone. Even if I load it again, I have a good change to solve the problem.
It also helps often to put the laptop to sleep and waking it up again.
My relevant dmesg part is: [ 7.186766] snd_hda_intel 0000:00:1b.0: probe_mask set to 0x1 for device 17aa:20ac [ 7.563277] snd_hda_codec_generic hdaudioC0D0: autoconfig for Generic: line_outs=1 (0x12/0x0/0x0/0x0/0x0) type:speaker [ 7.563281] snd_hda_codec_generic hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0) [ 7.563284] snd_hda_codec_generic hdaudioC0D0: hp_outs=1 (0x11/0x0/0x0/0x0/0x0) [ 7.563286] snd_hda_codec_generic hdaudioC0D0: mono: mono_out=0x0 [ 7.563288] snd_hda_codec_generic hdaudioC0D0: inputs: [ 7.563292] snd_hda_codec_generic hdaudioC0D0: Internal Mic=0x15 [ 7.563294] snd_hda_codec_generic hdaudioC0D0: Mic=0x14 [ 7.563297] snd_hda_codec_generic hdaudioC0D0: Dock Mic=0x1c
For reference I attach my kernel config to this mail. I am not sure if it is needed but better give as much as informations that I have.
So please, if you have any idea how to narrow that problem or even solve it, help would be appreciated.
Regards Klaus