2013-06-27

Linux, Audio Problem, pulseaudio

in Linux, if audio doesn't work, you can try

pulseaudio -k # kill it

then wait few seconds for it to die. You can check by

pgrep -l pulseaudio

then, start pulseaudio again.

pulseaudio --start # start it again

To start the sound level control panel, do:

setsid pavucontrol # start sound level control panel

now, if your desktop dock volume shows gray, you might need to restart it.

# restart xfce dock
pkill xfce4-panel
setsid xfce4-panel

The Linux audio problem is caused by the kernel having problem with several popular Logitech webcam. In my case, its Logitech HD Webcam C310 amazon

In your syslog, tail -f /var/log/syslog, you get flooded by this message:

kernel: [ 1438.563209] 3:3:4: cannot set freq 48000 to ep 0x86
kernel: [ 1438.563976] 3:3:4: cannot set freq 48000 to ep 0x86
kernel: [ 1438.565348] 3:3:4: cannot set freq 48000 to ep 0x86

The solution is just to unplug that webcam.

You can see bug report here. https://bugzilla.kernel.org/show_bug.cgi?id=44281