On Saturday, 10 March 2018 13:55:04 GMT Ralph Corderoy wrote:
> You *have* to use udev to map from USB port to an ID.
> Assuming assignment to cards is random, but with a strong bias or
> memory, i.e. can't be relied upon at all.

This behaviour occurs even though I am using the instructions to set the port 
to an ID using udev!  Things seem to have improved in this department since I 
moved my .asoundrc contents to /etc/asound.config, though I can't see why.  
(See my post at 11:41.)

I've just spotted something trying to replicate the problem on this machine.  
I get the following error from syslog whn I plug an adaptor in:

error opening ATTR{/sys/devices/pci0000:00/0000:00:1d.0/
usb2/2-1/2-1.7/2-1.7:1.0/sound/card1/pcmC1D0p/id} for writing: Permission 

So maybe udev has changed (again) and yet another technique is required.


                Terry Coles

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