[alsa-devel] CPU hook snd_hda_intel

From: Klaus Ethgen <Klaus@ethgen.ch>
To: alsa-devel@alsa-project.org
Subject: [alsa-devel] CPU hook snd_hda_intel
Date: Mon, 2 Dec 2019 19:47:59 +0100	[thread overview]
Message-ID: <20191202184759.GB29478@ikki.ethgen.ch> (raw)

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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
-- 
Klaus Ethgen                                       http://www.ethgen.ch/
pub  4096R/4E20AF1C 2011-05-16            Klaus Ethgen <Klaus@Ethgen.ch>
Fingerprint: 85D4 CA42 952C 949B 1753  62B3 79D0 B06F 4E20 AF1C

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