WARNING: Latest Linphone on Arch breaks device access

[Janina Sajka]

I'll study that doc, but I work best from cribbed examples. So, I'd like
to owe you a pizza and accept your most gracious offer!


Bus 002 Device 034: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter

Bus 002 Device 033: ID 0409:005a NEC Corp. HighSpeed Hub
Bus 002 Device 005: ID 0409:005a NEC Corp. HighSpeed Hub
Bus 002 Device 004: ID 045e:0047 Microsoft Corp. IntelliMouse Explorer 3.0
Bus 002 Device 003: ID 1395:3556 Sennheiser Communications USB Headset
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 04b8:0131 Seiko Epson Corp. GT-F720 [GT-S620/Perfection V30/V300 Photo]
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Chris Brannon writes:
> Janina Sajka <janina at rednote.net> writes:
> 
> > It was a great suggestion, Chris. Unfortunately, it seems there's yet
> > another bug in how alsa handles usb devices.
> >
> > I have 2 usb devices. No matter how I specify things, the card that gets
> > invoked is the first of those two.
> 
> Oh interesting.  So it looks like there's a name clash.
> Last time I dealt with multiple USB audio devices, they had unique
> human-friendly IDs by default.  My Logitech USB headset was called
> Headset, and my FM transmitter was called RocketFM.
> Apparently I was just lucky.
> 
> Not sure how much you know about alsa, so I'll also mention that
> you can see the human friendly IDs by looking for the symlinks in
> /proc/asound.  They're also listed in the output of aplay -l, but it's
> sort of non-intuitive what they are.
> 
> > Now, if I were really clever, I suppose I'd know how to write udev rules
> > to insure that the Sennheiser gets a lower card ID than the C-Media
> > device.
> 
> Well if you send me the output of lsusb, I can probably write some udev rules
> for you.  Or alternatively have a look at http://alsa.opensrc.org/Udev for a
> starting point.
> 
> -- Chris
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-- 

Janina Sajka,	Phone:	+1.443.300.2200
			sip:janina at asterisk.rednote.net
		Email:	janina at rednote.net

Linux Foundation Fellow
Executive Chair, Accessibility Workgroup:	http://a11y.org

The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI)
Chair, Accessible Platform Architectures	http://www.w3.org/wai/apa