you have plugged the speaker into the green jack at rear panel  since
the value of Line Out Front Jack is true

        control.38 {
                iface CARD
                name 'Line Out Front Jack'
                value true
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }

All desktop  with hda codec should be supported except some mothboard
with alc880 does not set the pin default

if your computer chassis have HDA Front audio panel (with pin 4
connected) , you need to setup the front audio panel type to HDA in BIOS
setup

please run alsamixer -c0  to check whether  the playback switch is not
muted and unmuted frequently


it is not clear that  module-switch-on-port-available switch to which port when 
availabilty of line out jack and headout jack are unknown

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https://bugs.launchpad.net/bugs/1207364

Title:
  no sound since upgrade to 13.04 [System Product Name, Realtek ALC892,
  Green Line Out, Rear] No sound at all

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