I have a system with 2 identical USB sound cards:
athena:/proc/asound# cat cards
0 [Audio ]: USB-Audio - USB Audio
C-Media INC. USB Audio at usb-0000:00:1d.2-1, full
speed
1 [Audio_1 ]: USB-Audio - USB Audio
C-Media INC. USB Audio at usb-0000:00:1d.3-1, full
speed
The problem is that I can't tell which is which. Every time the system
boots the cards move around.
Since they're identical I can't tell them by usbid:
athena:/proc/asound# cat card[01]/usbid
0d8c:0001
0d8c:0001
I wrote a script to tell them apart by usbbus, but it seems that the bus
numbers themselves keep changing.
athena:/proc/asound# cat card[01]/usbbus
003/002
004/002
The only thing that seems constant is /proc/asound/cards, but alas it's
not in a format that can be easily parsed by a script.
Is there some machine readable way to tell these cards apart?
--Yan
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