Comment 144 for bug 345627

Revision history for this message
Brad Bowman (launchpad-bereft) wrote :

Crackly sounds on a fresh Jaunty install. I've tried various things but
haven't upgraded the kernel/alsa yet.

I'm still not clear that this is the bug I'm having, is there diagnostic
test other than upgrading the kernel?

I changed /etc/pulse/client.conf to "autospawn = no" and ran
aplay and still got some skips and crackles, hopefully this is
showing it's not pulseaudio in my case (?).
Is this the right way to test alsa without pulseaudio involved?
(With autospawn still "no", I ran pulseaudio --start, then aplay,
then pulseaudio --kill and audio stopped as expected)

The "Sound Playback" test sound in System > Preferences > Sound (gnome)
was choppy/stuttering/glitchy via Auto, Alsa, OSS and PulseAudio (when running).
It sounds like morse code. One oddity is that the drop-out only occurs at
volume levels over about 80%, with glitches getting more frequent up to 100%.

http://www.alsa-project.org/db/?f=7cb7e160ca7c796d8a76619080c54086e374dadb

"ubuntu-bug alsa-base", recommended at https://launchpad.net/~crimsun,
wasn't showing me this bug to attach to, I guess because it's "Fix Released"?

$ pulseaudio --dump-conf | egrep 'real|prior|resample|nice'
I: caps.c: Limited capabilities successfully to CAP_SYS_NICE.
I: caps.c: Dropping root privileges.
I: caps.c: Limited capabilities successfully to CAP_SYS_NICE.
high-priority = yes
nice-level = -11
realtime-scheduling = no
realtime-priority = 5
resample-method = auto
rlimit-nice = 31