have you verify node 0x20 is HP by hda-jack-sense-test?
http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda?id=1f2e99febd5dd0c91f0d0752674029a4376649e5
Simple mixer control 'Jack Detect',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on]
have you verify node 0x20 is HP by hda-jack- sense-test?
http:// git.kernel. org/cgit/ linux/kernel/ git/tiwai/ sound.git/ commit/ sound/pci/ hda?id= 1f2e99febd5dd0c 91f0d0752674029 a4376649e5
Simple mixer control 'Jack Detect',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]