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

[Gabriele Mazzotta]

2015-04-19 19:26 GMT+02:00 Gabriele Mazzotta <gabriele.mzt at gmail.com>:
> 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?


Small update: I found that if I add a printk in alc_shutup_dell_xps13()
or I increase the delay from 20ms to 200ms, I get the pop noise on
start, with or without a551d91473 reverted. I will try to find out what
this delay is exactly affecting.