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

[Raymond Yau]

2012/3/9, Takashi Iwai <tiwai at suse.de>:
> At Fri,  9 Mar 2012 11:46:06 +0100,
> David Henningsson wrote:
>>
>> 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>
>
> Thanks, applied now.
>
>
> Takashi
>
>> ---
>>  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
>>  }
>>

How do the blacklist work ? since there is no "Logitect Web Camera" in
lsusb info

My  QuickCam Communicate Deluxe only support mono, so it is unlikely
for pulseaudio to open for digital capture