Comment 90 for bug 893210

0:72 = 1804
0:74 = 1001
0:76 = 2010

cat /proc/asound/card0/intel8x0
 Intel8x0

Global control : 0xc0000002
 Global status : 0x00700100
 SDM : 0x00000008
 AC'97 codecs ready : primary
 AC'97 codecs SDIN : 0 0 0

card*/codec97#0/ac97#?-?+regs
  Shows the AC97 register dump. Useful for debugging.

 recompile alsa driver with CONFIG_SND_DEBUG is enabled, you can write to this file for
  changing an AC97 register directly.

Pass two hex numbers.
  For example,

 # echo 02 9f1f > /proc/asound/card0/codec97#0/ac97#0-0+regs

this change master playback volume register

with headphone unplugged

set js1 mode bit of ac97 register 0x72

echo 72 1824 > /proc/asound/card0/codec97#0/ac97#0-0+regs

plug headphone

cat /proc/asound/card0/intel8x0

check bit 0 of global status is set or not

repeat the test with line out by set js0 mode

if gpi bit of global status was set after jack is plugged

we need to add a check of this bit in snd_intel8x0_interrupt and call those ad198x_handle_jp_jack