ubuntu-audio-dev team mailing list archive

[David Henningsson <david.henningsson@xxxxxxxxxxxxx>]

On 07/11/2013 05:18 AM, Luke Yelavich wrote:
> Resending, forgot to include David and the audio-dev mailing list.
>
> Hey folks.
> I
> I've been playing around with pulse etc on the nexus 7, and can get audio working with the following changes:
> * Disable the android audio system ALSA plugin, and its use in pulse.
> * Change some mixer settings as shown in the attach UCM config file, although we need not use UCM, we could do the same thing with a Pulseaudio audio profile.

To UCM or not to UCM, that's the question. I know it's meant for these 
kinds of things, but every time I try to use it, I get frustrated by its 
lack of documentation, I'm also unsure of how widely it is actually used 
out there.
It just doesn't seem to be production quality, but that's mostly a 
feeling I have, rather than actual fact.

So yeah, I'm hesitant to use UCM when there is an alternative. I'm 
having a hard time making up my mind myself for which road to take - UCM 
or pulseaudio profiles/paths. Any thoughts on that?

> * Unmute audio in the indicator, one extra step needed for Pulse, again a proper audio profile should fix thissss.

We might want to disable the alsactl init/store/restore stuff, 
completely for Ubuntu Touch, just to have one less thing to deal with. 
After all it was partially responsible for the long standing Nexus 7 bug 
with the desktop image, where sound was not working until after S3.

> I also filed bug #1198058 about the android audio system ALSA plugin causing multiple pulseaudio processes to be spawned, even if spawning is disabled in /etc/pulse/client.conf. I'm assuming that the android audio ALSA plugin works on other hardware, so it probably can't be backed out wholesale at the moment, but it would be nice to figure a way to back it out for the neuxs 7, so audio can work on touch images for that hardware.
>
> Thoughts?

It's good that you have things up and working! But as you probably know, 
you won't get automute of speaker on headset plugin by just writing a 
UCM file.

I've tried to take a wider approach, with jack detection, and some 
thoughts about how to deal with phone call mode (for Nexus 4). I have 
started writing some code for that, but timing has been against me - 
once the flipped container image was ready, and I had the Nexus 4 sent 
to me, it was vacation time...


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