Hi Takashi, When System Boot up. The Hda Driver running step was as below. alc_init(); alc_shutup(); alc_init(); The depop procedure was put in spec->init_hook and spec->shutup. But I find more codec which run spec->shutup at boot up. It will occur pop noise. If it doesn't run spec->shutup, it will not occur pop noise or reduce pop noise. How could the spec->shutup not run at boot up? I ever test to put the check in spec->shutup() for PM_EVENT_SUSPEND and PM_EVENT_HIBERNATE and shutdown. But if power_save=1, it was have issue for this. Codec was idle already in power_save=1 state. If system go suspend, it will not run spec->shutup() again. BR, Kailang _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
