[alsa-devel] Pop noise on startup when headphones are plugged in (Dell XPS13 9333)

[Gabriele Mazzotta]

On Monday 20 April 2015 07:58:15 Takashi Iwai wrote:
> At Sun, 19 Apr 2015 19:26:58 +0200,
> Gabriele Mazzotta wrote:
> > 
> > Hi,
> > 
> > I've recently found that commit a551d91473 ("ALSA: hda - Use regmap for
> > command verb caches, too") is somehow causing a pop noise on startup
> > when headphones are plugged in, but I couldn't figure out the exact
> > cause. Was this observed on other systems (mine is a Dell XPS13 9333,
> > Realtek ALC3661)? Does anyone have any idea of what the cause might be?
> 
> Are you sure that the commit is the culprit?  There are lots of other
> changes like the widget-based power saving.

Quite sure. I did a bisection to get it. 5e56bcea5017 ("ALSA: hda -
Allow driver to add vendor-specific verbs for regmap") is OK.
Also, if I revert a551d91473 in the current linux-next tree, the
startup noise goes away.

> In anyway, please give alsa-info.sh output.

http://www.alsa-project.org/db/?f=7d283ebf64ca750482ec5ed6174a1b860fa70631