Hello,
I'm part of the gang which has a bit of a problem with getting the
microphone jack work on a Dell M1210 laptop, which is equipped with
Intel HD Audio card (chip is identified SigmaTel STAC9221 A1 by
alsamixer). I read and poked around a bit, and I think I figured out
what the problem might be, however I need further advice on how to
handle it.
Looking at the /proc/asound/card0/codec#0, I can see that this card
has two ADCs (marked as [Audio Input]) at nids 0x06 and 0x07:
Node 0x06 [Audio Input] wcaps 0x1d0541: Stereo
Power: 0x0
Connection: 1
0x17
Node 0x07 [Audio Input] wcaps 0x1d0541: Stereo
Power: 0x0
Connection: 1
0x18
Each of them have a single input, nids 0x17 and 0x18 respectively:
Node 0x17 [Audio Selector] wcaps 0x300903: Stereo Amp-In
Amp-In caps: N/A
Amp-In vals: [0x0e 0x0e]
Connection: 1
0x12
Node 0x18 [Audio Selector] wcaps 0x300903: Stereo Amp-In
Amp-In caps: N/A
Amp-In vals: [0x80 0x80]
Connection: 1
0x13
AFAICT, those are just pass-through amps, since each of them have only
one input. Those inputs are 0x12 and 0x13, which are the audio
selectors:
Node 0x12 [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
Amp-Out caps: ofs=0x00, nsteps=0x04, stepsize=0x27, mute=0
Amp-Out vals: [0x04 0x04]
Connection: 7
0x0e 0x15* 0x0f 0x0b 0x0c 0x0d 0x0a
Node 0x13 [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
Amp-Out caps: ofs=0x00, nsteps=0x04, stepsize=0x27, mute=0
Amp-Out vals: [0x00 0x00]
Connection: 7
0x0e 0x15* 0x0f 0x0b 0x0c 0x0d 0x0a
The microphone jack (pink one, the right-most out of three on the
front) is 0x0c -- I figured it out by hacking up hda_proc.c to display
the pin sense. No other nid has 0x0c as its input, so I guess that the
only way to route the signal from microphone jack to the ADC is to use
one of the paths:
Pin(0x0c) -> Audio Selector(0x12) -> Audio Selector(0x17) -> Audio Input(0x06)
Pin(0x0c) -> Audio Selector(0x13) -> Audio Selector(0x18) -> Audio Input(0x07)
I tried routing the input from 0x0c to audio selectors 0x12 and 0x13
(by hacking on patch_sigmatel.c). That worked, but I still didn't get
any audible input from the mic. I am a bit at loss on where to go from
here. I suspect that some of the amps in the chain may be
disabled/muted, and alsamixer does not provide any controls for them
(or something). I'd appreciate any advice, as the non-working mic is
pretty much the only thing which keeps me unhappy about my new laptop
:-). Just in case, I did try disable_msi=1 trick and different models,
that did not make any difference. I would be willing to provide any
other information or test patches, if need arises.
You can find the complete output of /proc/asound/card0/codec#0 at
http://www.wooyd.org/misc/codec.txt
Best regards,
--
Jurij Smakov jurij@xxxxxxxxx
Key: http://www.wooyd.org/pgpkey/ KeyID: C99E03CC
-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys - and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
Alsa-devel mailing list
Alsa-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/alsa-devel
