send email to the author to fix the pin default
http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda/patch_sigmatel.c?id=29ac83635fcf244a7178f9fc8f918cd7ddf799d5
Codec: SigmaTel STAC9271D
Address: 2
AFG Function Id: 0x1 (unsol 1)
Vendor Id: 0x83847627
Subsystem Id: 0x80862504
Revision Id: 0x100201
Node 0x0d [Pin Complex] wcaps 0x400181: Stereo
Control: name="Speaker Jack", index=0, device=0
Pincap 0x0000173f: IN OUT HP Detect Trigger ImpSense
Vref caps: HIZ 50 GRD 80
Pin Default 0x01114210: [Jack] Speaker at Ext Rear
Conn = 1/8, Color = Green
DefAssociation = 0x1, Sequence = 0x0
Pin-ctls: 0x40: OUT VREF_HIZ
Unsolicited: tag=04, enabled=1
Connection: 1
0x02
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https://bugs.launchpad.net/bugs/1185629
Title:
Background hissing sound even when volume muted
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