Public bug reported:
Default sound buffer set by ALSA for USB soundcards (in my case 0d8c:0006
C-Media Electronics, Inc. with CM-106 chipset, usb-audio driver,
/proc/asound/cards says:
0 [Audio ]: USB-Audio - USB Audio
USB Audio at usb-0000:00:1d.0-2, full speed
) is too low for ordinary, 2-channel playback. Sound skips from time to time
regardless of the system load and I/O usage. Seems the latency of PCI/USB bus
is higher than the default buffer size set by ALSA. The configuration which
resolves the problem looks like this (/etc/asound.conf):
defaults.ctl.card 0
defaults.pcm.card 0
pcm.card0 {
type hw
card 0
}
pcm.dmixer {
type dmix
ipc_key 1025
slave {
pcm "hw:0,0"
period_time 0
period_size 2048
buffer_size 32768
rate 48000
}
bindings {
0 0
1 1
}
}
pcm.skype {
type asym
playback.pcm "dmixer"
capture.pcm "card0"
}
pcm.!default {
type plug
slave.pcm "skype"
}
The buffer_size used here might be too large, but I haven't encountered
any problems since using that configuration.
** Affects: alsa-lib (Ubuntu)
Importance: Undecided
Status: New
--
default snd-usb-audio alsa buffer too low (causes pops and clicks)
https://bugs.launchpad.net/bugs/129887
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