Pulse audio stutters during moderate cpu usage in hardy beta

[Afkpuz]

Binary package hint: pulseaudio

After the recent switch to pulse audio in hardy heron beta, my audio stutters when doing things that require moderate cpu usage. In particular, when running desktop effects like the minimize button (window zooms out, fades out, and moves to taskbar), the audio stutters. I minimize quite frequently, so this is a problem. I checked the system monitor and cpu usage jumps above 50 percent when this stutter happens. I'm running all up-to-date as of april 6 with all the hardy heron beta updates installed. I can post any additional information needed.

The version of pulseaudio that is currently installed is:

pulseaudio:
  Installed: 0.9.9-1ubuntu4
  Candidate: 0.9.9-1ubuntu4
  Version table:
 *** 0.9.9-1ubuntu4 0
        500 http://us.archive.ubuntu.com hardy/main Packages
        100 /var/lib/dpkg/status

[Kieran Hogg (xerosis)]

I can confirm this, however my stuttering seems to carry on after the event and can only be stopped by a reboot or suspend.

[Matti Lindell (mlind)]

Try adding the desktop user(s) to 'pulse-rt' group and then relogin.

$ sudo adduser $USER pulse-rt
(quit your gdm/kdm session)

Output of command 'groups' should contain pulse-rt group.

Does the stuttering still occur?

[Daniel T Chen (crimsun)]

8.04.1 contains a kernel with a scheduler config adjustment that should alleviate this symptom. One other aspect is using the speex-float-0 or speex-float-1 resampler in /etc/pulse/daemon.conf.