[Pkg-alsa-devel] Bug#628652: alsa-base: audio from web browsers contains cracking, clipping and other audio artifacts

[Christopher Meiklejohn]

Package: alsa-base
Version: 1.0.23+dfsg-4
Severity: normal


Good evening,

I'm having a problem where audio coming from certain apps is clipping,
cracking and containing large amounts of digital artifacts.  For
example, audio coming from webpages such as rdio.com, mog.com (or any
other HTML audio.)  This started happening after an update to the
latest packages on unstable/sid.  I've been able to reproduce this in
iceweasel, chromium, google-chrome-unstable and epiphany-browser.

What is working fine:

1. Recording and playback with Audacity is fine.
2. Adobe flash audio is fine in those browsers.
3. Rhythmbox and Banshee playback is also fine.

Let me know what other information I can provide to help debug this
further.

-- Package-specific info:
--- Begin additional package status ---
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                               Version
                                   Description
+++-==================================================-==================================================-====================================================================================================================
ii  libasound2                                         1.0.23-4
                                   shared library for ALSA
applications
--- End additional package status ---
--- Begin /proc/asound/version ---
Advanced Linux Sound Architecture Driver Version 1.0.24.
--- End /proc/asound/version ---
--- Begin /proc/asound/cards ---
 0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xf2520000 irq 43
29 [ThinkPadEC     ]: ThinkPad EC - ThinkPad Console Audio Control
                      ThinkPad Console Audio Control at EC reg 0x30,
fw 6QHT28WW-1.09
--- End /proc/asound/cards ---
--- Begin /dev/snd/ listing ---
total 0
drwxr-xr-x  2 root root       80 May 30 21:45 by-path
crw-rw----+ 1 root audio 116,  8 May 30 21:45 controlC0
crw-rw----+ 1 root audio 116,  2 May 30 21:45 controlC29
crw-rw----+ 1 root audio 116,  7 May 30 21:45 hwC0D0
crw-rw----+ 1 root audio 116,  6 May 30 21:45 hwC0D3
crw-rw----+ 1 root audio 116,  5 May 30 22:23 pcmC0D0c
crw-rw----+ 1 root audio 116,  4 May 30 22:50 pcmC0D0p
crw-rw----+ 1 root audio 116,  3 May 30 21:53 pcmC0D3p
crw-rw----+ 1 root audio 116,  1 May 30 21:45 seq
crw-rw----+ 1 root audio 116, 33 May 30 21:45 timer
--- End /dev/snd/ listing ---

-- System Information:
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.39-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages alsa-base depends on:
ii  linux-sound-base           1.0.23+dfsg-4 base package for ALSA and OSS soun
ii  module-init-tools          3.12-1        tools for managing Linux kernel mo
ii  udev                       170-1         /dev/ and hotplug management daemo

Versions of packages alsa-base recommends:
ii  alsa-utils                   1.0.23-5+b1 Utilities for configuring and usin

Versions of packages alsa-base suggests:
pn  alsa-oss                      <none>     (no description available)
ii  apmd                          3.2.2-14   Utilities for Advanced Power Manag
pn  oss-compat                    <none>     (no description available)

Versions of packages libasound2 depends on:
ii  libc6                         2.13-4     Embedded GNU C Library: Shared lib

Versions of packages libasound2 suggests:
ii  libasound2-plugins            1.0.23-2   ALSA library additional plugins

-- no debconf information