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Old 02-16-2009, 11:57 AM
"Cody A.W. Somerville"
 
Default Notable Changes to Jaunty's PulseAudio

Hello,

On Sun, Feb 15, 2009 at 8:38 PM, Luke Yelavich <themuso@ubuntu.com> wrote:

Forwarded from ubuntu-devel-discuss to ensure all Ubuntu developers see this.



----- Forwarded message from Dan Chen <crimsunkg@yahoo.com> -----



From: Dan Chen <crimsunkg@yahoo.com>

To: ubuntu-devel-discuss@lists.ubuntu.com

Subject: Notable Changes to Jaunty's PulseAudio

Date: Sun, 15 Feb 2009 18:36:13 -0500



Hi all,



This morning's upload of PulseAudio to jaunty makes two notable changes for the desktop user:



Firstly, autospawn is now enabled, which means that if the daemon is not running when the first client attempts to connect, it will be executed automatically. This step tests a workaround for the daemon ABENDing while we further debug the root cause. The impact of this change is that PulseAudio users who have desktop environments other than GNOME running may experience some nondeterministic behaviour for the default capture and playback devices when the daemon initially autospawns. Please report any such issues using the Launchpad bug tracker.

I woke up this morning hoping to be able to listen to some ABBA. Unfortunately, sound no longer works in my Xubuntu.

Furthermore, I was hoping to avoid shipping/enabling pulseaudio with Xubuntu. Does this now mean that pulseaudio is required?

*



Secondly, we have globally disabled glitch-free to work around a number of driver bugs that do not seem addressable within the jaunty development span. This change reverts PulseAudio behaviour to rely on the driver's interrupt-based buffering semantics, which appear to be more stable for a significant number of jaunty testers. If you would like to reenable glitch-free, edit /etc/pulse/default.pa and change:




load-module module-hal-detect tsched=0

to:

load-module module-hal-detect



Again, please report regressions from the existing jaunty PulseAudio package using the Launchpad bug tracker.



Thanks,

Dan

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Cheers,
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Cell: +1-506-471-8402
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Old 02-16-2009, 01:01 PM
Mario Limonciello
 
Default Notable Changes to Jaunty's PulseAudio

Hi:

On Mon, Feb 16, 2009 at 06:57, Cody A.W. Somerville <cody-somerville@ubuntu.com> wrote:


I woke up this morning hoping to be able to listen to some ABBA. Unfortunately, sound no longer works in my Xubuntu.

Furthermore, I was hoping to avoid shipping/enabling pulseaudio with Xubuntu. Does this now mean that pulseaudio is required?


*I'll raise a similar objection for Mythbuntu.* Until pulseaudio works entirely problem free with all of the apps we ship, we can't ship/enable it either.

Regards



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Old 02-16-2009, 01:06 PM
Scott James Remnant
 
Default Notable Changes to Jaunty's PulseAudio

On Mon, 2009-02-16 at 08:57 -0400, Cody A.W. Somerville wrote:

> I woke up this morning hoping to be able to listen to some ABBA.
> Unfortunately, sound no longer works in my Xubuntu.
>
This sounds more like a feature than a bug

Scott
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Old 02-16-2009, 06:09 PM
Mackenzie Morgan
 
Default Notable Changes to Jaunty's PulseAudio

On Monday 16 February 2009 7:57:45 am Cody A.W. Somerville wrote:
> I woke up this morning hoping to be able to listen to some ABBA.
> Unfortunately, sound no longer works in my Xubuntu.
>
> Furthermore, I was hoping to avoid shipping/enabling pulseaudio with
> Xubuntu. Does this now mean that pulseaudio is required?

No, it means that if you have ubuntu-desktop already installed you will have
PulseAudio run by default most likely in all sessions. PulseAudio is still not
required for non- ubuntu-desktop systems.

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Old 02-20-2009, 06:50 AM
Dan Chen
 
Default Notable Changes to Jaunty's PulseAudio

Hi folks,

The latest PulseAudio upload in jaunty actually effects the
autospawn change intended in the previous upload. I anticipate
an outpouring of Launchpad activity over it.

My previous e-mail was woefully lacking in rationale, so I'll
address both the enabling of autospawn and the disabling of
glitch-free.

Firstly, autospawn. There are two significant reasons for
making such a change, and neither one of them is "force
PulseAudio use on everyone". As nifty as that conspiracy
theory would be, the real reasons are:

1) Expose races between PA unsuspending the sink(s) and some
native ALSA (or OSS-only) app grabbing hw: (or /dev/dsp);
2) Test the pulse alsa-lib plugin for buffering problems (as
exhibited by Firefox 3.2 testing).

In short, your audio will very likely break after the upgrade
completes (to 0.9.14-0ubuntu7). GStreamer and xine-lib apps
will appear to hang, but stopping them and resuming play will
be the easier way to work around the hang.

The culprit actually lies in poor interaction between the
driver (in linux) and the library (in alsa-lib). git HEAD of
PulseAudio contains some workarounds for it, and Luke's PPA[0]
will be tracking those 0.9.15 test releases (which require
significant upgrades in various layers of the audio stack and
likely are not suitable for jaunty).

Secondly, glitch-free. I've identified where glitch-free is
breaking for many users, but there is no one setting that can
magically make the audio aberrations "go away". Because 0.9.14
is fairly different from 0.9.15, I have a separate branch[1]
for queueing changes for reenabling glitch-free.

The objective for shipping jaunty is have both autospawn and
glitch-free enabled, but the testing period will help determine
which of those options is feasible in time for release. Thank
you for helping test-drive jaunty!


[0] https://launchpad.net/~themuso/+archive/ppa
[1] https://code.launchpad.net/~crimsun/pulseaudio/timing




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Old 03-04-2009, 06:14 AM
Steve Langasek
 
Default Notable Changes to Jaunty's PulseAudio

Hi Dan,

On Thu, Feb 19, 2009 at 11:50:32PM -0800, Dan Chen wrote:
> The latest PulseAudio upload in jaunty actually effects the
> autospawn change intended in the previous upload. I anticipate
> an outpouring of Launchpad activity over it.

> My previous e-mail was woefully lacking in rationale, so I'll
> address both the enabling of autospawn and the disabling of
> glitch-free.

[...]

> The objective for shipping jaunty is have both autospawn and
> glitch-free enabled, but the testing period will help determine
> which of those options is feasible in time for release. Thank
> you for helping test-drive jaunty!

What has been the outcome of this testing? The upgrade was fairly painless
for me, but I know that may not be indicative; are there still race
conditions outstanding that pose a risk to the stability of the jaunty
release?

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