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
                        }


** Changed in: alsa-driver (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1505584

Title:
  [Realtek ALC887-VD] Playback only through 2 channels by default

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