[pulseaudio-discuss] [PATCH] module: new null-source module

[Mark Brown]

On Wed, Apr 27, 2011 at 05:07:44PM +0200, David Henningsson wrote:

Adding Marga and Liam, not cutting text as a result.

> On 2011-04-27 16:55, David Henningsson wrote:
>>> So I'll do some testing then grab it at some point (tho' need to spend
>>> some time reviewing Margarita's work before next week otherwise Liam and
>>> Mark will find some way to punish me!)
>>
>> FYI, I've done some review of that code already, and I agree with
>> plbossart's comments recently about the jack detection being done the
>> wrong way.
>>
>> In addition, I don't think we (as in Canonical/Ubuntu) even got it to
>> work yet even though we've tried it several times. You can see some of
>> it here: https://bugs.launchpad.net/ubuntu/+source/alsa-lib/+bug/746023
>>
>> So I don't think it's ready. The question about how we can make it ready
>> might be a topic for next week's conference perhaps. See you!
>
> Hmm, that was not supposed to go to the list.. *blushes*
>
> Anyway, I haven't been much involved with the ucm stuff until a few  
> weeks ago, but I'll see next week (during either the ASoC conference,  
> LAC, or UDS) if I can grab one of these pandaboards, play around a  
> little with UCM and get it explained to me (alsaucm could use a man  
> page!), and see if I can understand why we never got those patches to  
> work reliably in Ubuntu 11.04.

You're not really supposed to use alsaucm directly except for testing
and developing new configurations, I'd not expect it to play nicely with
an application that's also driving UCM.

Sounds from a brief scan like the issue with the defaults getting lost
on boot is that Pulse needs to start storing the state itself (I'd
expect on a per use case basis) rather than relying on something else
doing so underneath it.  Trying to restore a state which may correspond
to a totally different use case is going to be fail, and restoring state
that is part of the use cases has obvious issues too.  But I've not read
the report properly so I'm mostly just guessing here.