Automatically switching snd_hda_intel.power_save value when switching from battery to ac ?

[Hans de Goede]

Hi,

Because of a bug-report about power-saving related plops/clocks on a
Lenovo T470s, I've asked inside Red Hat if people with a T470s and
running a recent kernel were also experiencing this.

Most people are happy with the audio, but I did get a few bug reports
about plops on the headphones-jack.

One of the suggestions which I got from 2 different users is to
disable power-saving for the HDA driver when on AC, esp. since most
headphones-jack use (esp. with an external amplifier which amplifies
the problem) is done while the laptop is sitting on a desk and thus
typically is connected to a charger.

I'm personally not necessarily a fan of changing settings based
on being connected to ac or not, but I guess that in this case
it might not be such a bad idea ?

Regards,

Hans