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

[Takashi Iwai]

On Thu, 05 Mar 2020 15:33:04 +0100,
Hans de Goede wrote:
> 
> 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 ?

Actually the power-saving-toggle-on-demand used to be the standard
behavior by some power management tools including some
thinkpad-specific one, IIRC.  So the behavior itself isn't too bad if
the pop noise can't be fully eliminated.


thanks,

Takashi