Comment 37 for bug 1539209

 > It is unlikely that your patch fix the problem since none of the drivers of those users have a volume control with multi channel

I found this:

 control.15 {
  iface MIXER
  name 'Line Capture Route'
  value.0 false
  value.1 false
  value.2 false
  value.3 false
  comment {
   access 'read write'
   type BOOLEAN
   count 4
  }
 }