Comment 17 for bug 1245624

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda/patch_realtek.c?id=67b6ec3196da235317ff1b9474f17379b78f3294

send email to the author to add a 6stack_digout_digin_automute for your alc1200

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01127593&tmp_track_link=ot_faqs/top_issues/en_us/c01127593/loc:2&cc=us&dlc=en&lc=en&product=3464130#N1069

2 - Coaxial SPDIF Out
4 - Audio: Rear Speaker Out (black)
5 - Audio: Center/Subwoofer (yellow orange)
6 - Audio: Line In (light blue)
7 - Audio: Line Out (lime)
8 - Audio: Microphone (pink)
9 - Audio: Side Speaker Out (gray)
13 - Coaxial SPDIF In