[alsa-devel] snd_hda_intel: coil whine noises after resume

[Francisco G.]

Hello.

Some users included myself have noticed coil-whine-like noises coming
through the headphones after the computer resumes from sleep. This noise is
clearly associated to the laptop activity, e.g. when scrolling through a
webpage or compiling something, the processor can be heard doing the work.

Interestingly, the coil whine that can be heard from the computer with
naked ears (which is a common problem with this laptop) is also increased
after resume.

The problem has been observed on a Dell XPS 13 9360 with an i7-8550U CPU by
myself, as well as with an i5-8250U by a user in the Arch Linux forums
<https://bbs.archlinux.org/viewtopic.php?pid=1759588#p1759588>. This user
has also noticed that reloading the snd_hda_intel module fixes the issue.

Please let me know of any inormation that would be needed to debug this
problem.