Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: pulseaudio (Ubuntu)
Status: New => Confirmed
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1067466
Title:
Sampling rate issues with M-Audio MobilePre usb audio interface
Status in “pulseaudio” package in Ubuntu:
Confirmed
Bug description:
Plugging an M-Audio MobilePre USB sound device into several Ubuntu and
Ubuntu-drived installations consistently results in incorrect audio
playback. Playback was fine until 11.04 I believe, after which I
believe the kernel jumped to a new major revision, and it hasn't
worked out of the box on any Ubuntu or Mint-based systems since. The
device is currently plugged in to a Mint 12 system:
uname -a prints:
Linux ctn00 3.0.0-26-generic #43-Ubuntu SMP Tue Sep 25 17:19:22 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
I don't know how to diagnose the problem (I don't see anything
obviously wrong in dmesg), but I am happy to check things that devs
believe to be diagnostic.
I've tried playing to the pulseaudio device from several sources:
speaker test, chrome browser, and Mplayer... sound issues are the same
for each player.
Two workarounds I've found are
(a) Open the sound settings window in e.g. Ubuntu's default window
manager / graphical environment, which I think is a pulseaudio control
center. Switch tabs and select the MobilePre as Output and Input
device (even though it was already selected... just go back and click
on it), and LEAVE THE APPLET OPEN. If the Applet closes, then sound
goes to hell, but as long as the applet is open or minimized, then it
seems to keep things going (very strange). This results in perfect
playback.
(b) Open /etc/pulse/daemon.conf file, set the default sampling rate to
48000. This tip was gleaned from an ArchLinux wiki page on PulseAudio.
It makes sound playback *almost* correctly, but there is still a hint
of static / sampling noise that occurs somewhat sporadically. This
workaround doesn't require having a dummy window open, but also
doesn't entirely solve the problem.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1067466/+subscriptions
--
Mailing list: https://launchpad.net/~desktop-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~desktop-packages
More help : https://help.launchpad.net/ListHelp
