; alsactl -f /tmp/foo.ctl 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

The resulting alsactl file is attached.

Note that I have hacked alsactl to make such errors
non-fatal;  otherwise it would have died after the
first message.

Also, in the following, note the bizarre numbers (values
of the 'index' variable)

  ; alsactl -f /tmp/foo.ctl 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

  ; amixer
amixer: Mixer load error: default

  ; alsamixer
alsamixer: function snd_mixer_load failed: Invalid argument