Choppy playback on Snowball through pulseaudio
Bug #939593 reported by
Kalle Vahlman
This bug affects 3 people
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
IglooCommunity |
Fix Released
|
Medium
|
Ramesh Chandrasekaran | ||
Linaro Multimedia WG project |
Won't Fix
|
Undecided
|
Unassigned | ||
Linaro Ubuntu |
Won't Fix
|
Undecided
|
Unassigned |
Bug Description
The 2012.02 release introduced proper settings to make pulseaudio work with audio-out jack on snowball, however the playback is choppy.
Observable for example in the sound settings, hardware tab has the Test Speakers utility. Clicking on the left/right channel testers produces only parts of "front left" and "front right".
Changed in igloocommunity: | |
milestone: | none → 2012.03 |
Changed in igloocommunity: | |
status: | New → Confirmed |
importance: | Undecided → High |
assignee: | nobody → Lee Jones (lag) |
Changed in linaro-ubuntu: | |
assignee: | nobody → Ricardo Salveti (rsalveti) |
tags: | added: multimedia |
Changed in igloocommunity: | |
importance: | High → Medium |
Changed in igloocommunity: | |
assignee: | Lee Jones (lag) → Thomas Espersson (espersson) |
Changed in linaro-ubuntu: | |
status: | New → Confirmed |
importance: | Undecided → Medium |
milestone: | none → 12.04 |
Changed in igloocommunity: | |
assignee: | Thomas Espersson (espersson) → Ramesh Chandrasekaran (ramesh-chandrasekaran) |
Changed in igloocommunity: | |
milestone: | 2012.04 → 2012.05 |
Changed in linaro-ubuntu: | |
assignee: | Ricardo Salveti (rsalveti) → Riku Voipio (riku-voipio) |
milestone: | 12.04 → 12.05 |
Changed in linaro-multimedia-project: | |
assignee: | nobody → Feng Wei (b34248) |
milestone: | none → 2012.05 |
Changed in igloocommunity: | |
milestone: | 2012.05 → 2012.06 |
Changed in linaro-ubuntu: | |
milestone: | 12.05 → 12.06 |
Changed in igloocommunity: | |
status: | Confirmed → In Progress |
Changed in linaro-ubuntu: | |
milestone: | 12.07 → 12.08 |
Changed in linaro-ubuntu: | |
milestone: | 12.08 → 12.09 |
Changed in igloocommunity: | |
status: | Fix Committed → Fix Released |
Changed in linaro-ubuntu: | |
milestone: | 12.09 → none |
Changed in linaro-ubuntu: | |
assignee: | Riku Voipio (riku-voipio) → nobody |
importance: | Medium → Undecided |
status: | Confirmed → Won't Fix |
Changed in linaro-multimedia-project: | |
status: | New → Won't Fix |
assignee: | Feng Wei (b34248) → nobody |
milestone: | 2012.05 → none |
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Copying over the comment from the previous bug#:
As tested with the 12.02 RC2 images, audio works from command line:
aplay -Dhw:0,1 /usr/share/ sounds/ alsa/Side_ Left.wav
but is heavily distorted in pulseaudio. For example try speaker tests in gnome sound settings.
Switching pulseaudio from timer based scheduling to interrupt based fixed the choppiness for me:
17:35 < suihkulokki> in /etc/pulse/ default. pa:
17:35 < suihkulokki> -load-module module-udev-detect
17:35 < suihkulokki> +load-module module-udev-detect tsched=0
it is apparently considered a bug in the alsa driver if pulseaudio cannot use timer scheduling, and we probably shouldn't change the default for all boards.
Explanation of timer based scheduling in pulseaudio at:
http:// 0pointer. de/blog/ projects/ pulse-glitch- free.html