[alsa-devel] [PATCH] USB-Audio: Disable "Logitech USB Headset" iec958 device

David Henningsson david.henningsson at canonical.com
Wed Mar 7 11:23:04 CET 2012

Because Logitech USB Headsets do not have any digital devices,
prevent them from being opened. This simplifies probing the
device in PulseAudio.

BugLink: https://bugs.launchpad.net/bugs/940145
Signed-off-by: David Henningsson <david.henningsson at canonical.com>

I did not get any responses to my "digital profile" mail sent to alsa-devel
Feb 24th, but it seems the easiest workaround is the below patch for alsa-lib.
Alsa-info at:

 src/conf/cards/USB-Audio.conf |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/conf/cards/USB-Audio.conf b/src/conf/cards/USB-Audio.conf
index 0726c34..f488284 100644
--- a/src/conf/cards/USB-Audio.conf
+++ b/src/conf/cards/USB-Audio.conf
@@ -36,6 +36,8 @@ USB-Audio.pcm.surround40_type {
 # number for the iec958 device can be changed here.
 USB-Audio.pcm.iec958_device {
 	# "NoiseBlaster 3000" 42
+	# Make sure we can't open this device digitally, because it does not exist
+	"Logitech USB Headset" 999 

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