[alsa-devel] [PATCH v2] USB-Audio: Blacklist iec958 for some USB devices

[David Henningsson]

Some common USB devices are analog only, so prevent the digital
devices from being opened. This simplifies probing the device
in PulseAudio.

I have a "Logitech USB Headset" myself, the "Logitech Web Camera"
was reported by Raymond Yau, and the "Blue Snowball" was reported by
Andy Whitcroft.

Cc: Andy Whitcroft <andy.whitcroft at canonical.com>
Cc: Raymond Yau <superquad.vortex2 at gmail.com>
BugLink: https://bugs.launchpad.net/bugs/940145
Signed-off-by: David Henningsson <david.henningsson at canonical.com>
---
 src/conf/cards/USB-Audio.conf |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/src/conf/cards/USB-Audio.conf b/src/conf/cards/USB-Audio.conf
index 0726c34..d7c121e 100644
--- a/src/conf/cards/USB-Audio.conf
+++ b/src/conf/cards/USB-Audio.conf
@@ -36,6 +36,11 @@ USB-Audio.pcm.surround40_type {
 # number for the iec958 device can be changed here.
 USB-Audio.pcm.iec958_device {
 	# "NoiseBlaster 3000" 42
+
+	# The below don't have digital in/out, so prevent them from being opened.
+	"Logitech USB Headset" 999
+	"Logitech Web Camera" 999
+	"Blue Snowball" 999
 }
 
 
-- 
1.7.9