[laptop-mode] AC vs. Battery snd_hda_intel powersave

[Bart Samwel]

Hi Alberto,

Alberto Gonzalez wrote:
> I have an HP mini 1000 laptop (or netbook if you like) and I have a small 
> problem with enabling power save mode on the snd_hda_intel module: about a 
> second after playing a sound the speakers switch off (as expected), but this 
> produces an audible click. It's mildly annoying, so I have to decide if I 
> prefer to waste a bit of power or to bear with the click - obviously this is a 
> bug and hopefully it will be solved at some point, but that's not the point 
> here. The point is that I'd like to enable powersave mode while on battery, 
> but disable it while on AC power. But the file to configure this says that 
> enabling powersave mode does not hurt, so they don't give an option for 
> battery and AC. In my case, it does hurt a bit, and I guess there will always 
> be others with some similar problem. So my request is: could this feature be 
> implemented? It's just natural to have the option in the same way as with all 
> other settings.

Yes, that feature is on the wish list and it will be implemented in the
next release. At first we thought there was no downside to the power
saving mode, so it was natural to enable the power saving mode always.
Now that we know there's audible clicks, we'll implement the switch!

> Meanwhile, could I manually put something in that file that would do the trick 
> for me?

Nope -- unfortunately this requires actual code changes.

Cheers,
Bart