On Mon, 26 Nov 2018 00:17:15 +0100, Alexander Kappner wrote: > > My Lenovo P50 laptop has a BIOS option to disable the microphone. When > this option gets chosen, the snd_hda_intel driver causes high CPU load > on a single kworker thread, spinning on "process_unsol_events", and > system > instability. This behavior occurs from the time that the snd_hda_intel > module is loaded, irrespective of whether anything is attempting to access > the mic. The sound output still works. > > When in this state, the module cannot be removed cleanly; attempting to > remove it (even without rmmod -f) triggers an oops. > > I have attached two exemplary dmesg outputs. Strangely enough, the exact > location of the oops varies, but further up the call chain, I always see > process_unsol_events. > > When the mic is not disabled in the BIOS, the module works stable, > regardless whether or not the mic is muted in ALSA. > > I wasn't able to pinpoint the root cause. Any pointers on where to > start? Much appreciated. Could you load snd-hda-intel driver with probe_only=1 option, and give alsa-info.sh output (run it with --no-upload option)? This should leave only the codec probing without configuring, so we can see the codec widget contents and check the emulator. thanks, Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
