Re: Re^2: A persistent name for a sound device.

[Alan Greenberger <alanjg@ptd.net>]

On 2014-02-04, peter@easthope.ca <peter@easthope.ca> wrote:
> Alan,
>
> *	From: Alan Greenberger 
> *        Date: Mon, 3 Feb 2014 09:34:42 -0500
>> When I plug in a Logitech C170 webcam, /proc/asound/cards shows:
>>  0 [SB             ]: HDA-Intel - HDA ATI SB
>>                       HDA ATI SB at 0xfbdf4000 irq 16
>>  1 [HDMI           ]: HDA-Intel - HDA ATI HDMI
>>                       HDA ATI HDMI at 0xfbeec000 irq 44
>>  2 [C170           ]: USB-Audio - Webcam C170
>>                       Webcam C170 at usb-0000:00:13.2-4, high speed
>
> Suppose you reboot the machine without changing the hardware.
> Does each device always retain its card number across the reboot?
> In my case no.  Consequently I can reboot and find that the
> VoIP ring is being sent to the headset.  Not acceptable.
>
> A persistent name remains associated with a specific device
> across a reboot.
>
> Regards,               ... Peter E.
>

The point was that even though the card number may change, I can use the
device as -D hw:C170 without needing the card number.