[pulseaudio-discuss] Muting while changing ports

[David Henningsson]

On 09/21/2011 04:16 PM, Tanu Kaskinen wrote:
> On Wed, 2011-09-21 at 17:08 +0300, David Henningsson wrote:
>> On 09/21/2011 02:22 PM, Tanu Kaskinen wrote:
>>> Hi,
>>>
>>> There exists audio hardware that produces annoying noise (snap, crackle,
>>> pop) when changing the alsa mixer settings, unless hw mute is used
>>> during the mixer changes. I'm planning to fix this by using hw mute
>>> during path activation, if the path provides hw mute. If anyone has
>>> objections or other comments, the best time to publish them would be
>>> now :)
>>
>> Does not sound like anything I would like to enable by default - e g,
>> what if hw mute introduces a click, and changing the volume does not?
>
> If you think that such hardware is likely to exist,

It seems more likely than what you're describing, but take that with a 
grain of salt - I have no real data to back it up.

> then I guess I'll
> have to make this configurable, and disable it by default. The path
> configuration files would get a new option for the [General] section:
> "mute-during-activation = yes/no". Does that sound ok to you?

May I ask if this is driven by specific (non-PC) hw where you experience 
this problem, or if you see a general need for it?

Anyway, it seems that the logical place to put this in would be at the 
(udev quirkable) card level, that way PA could potentially ship with a 
quirk database for hw that needs this enabled. Do you agree?

-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic