Comment 4 for bug 1505584

you need to add hook to front device and surround40 in order to get back the input jacks after probing surround51

hooks.0 {
   type ctl_elems
   hook_args [
   {
    name "Channel Mode"
    preserve true
    value "2ch"
    lock true
    optional true
   }
}

hooks.0 {
   type ctl_elems
   hook_args [
   {
    name "Channel Mode"
    preserve true
    value "4ch"
    lock true
    optional true
   }