Re: sb16 gets wedged when doing overlapped i/o (full duplex)

["John S. Denker" <jsd@monmouth.com>]

     ==== This is a slightly-updated clone of item
     #636948 on the sourceforge bug/patch reporting
     system.  I'm moving it to here (the alsa-devel
     mailing list) at the request of Jaroslav. ====

When talking to Extigy on the USB bus:

    alsactl -f /tmp/foo store
alsactl: get_control:202: Cannot read control'2,0,0,Digital In Playback 
Source,0': Invalid argument
alsactl: get_control:202: Cannot read control '2,0,0,3D Stereo Extender 
Switch,0': Invalid argument
alsactl: get_control:202: Cannot read control '2,0,0,Up Down Switch,0': 
Invalid argument
alsactl: get_control:202: Cannot read control '2,0,0,Up Down Mode 
Select,0': Invalid argument

    alsactl -f /tmp/foo restore
alsactl: set_control:976: Cannot write control '2:0:0:Digital In 
Playback Source:134521100' : Invalid argument
alsactl: set_control:976: Cannot write control '2:0:0:3D Stereo Extender 
Switch:134521100' : Invalid argument
alsactl: set_control:976: Cannot write control '2:0:0:Up Down 
Switch:134521100' : Invalid argument
alsactl: set_control:976: Cannot write control '2:0:0:Up Down Mode 
Select:134521100' : Invalid argument

I modified alsactl to mke the foregoing errors non-fatal. That allowed
me to progress far enough to discover other errors, as reported a few
minutes ago.

Alsamixer also dies with "invalid argument".

I suspect this is a driver bug (as opposed to a utils bug) because I
suspect the driver is misinforming the utils as to what controls it
offers.



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