[Bug 42600] Microphone does not work on Dell Inspiron 630m

[Andrew Bennetts]

Public bug reported:

I cannot get the microphone input on my Dell Inspiron 630m laptop to
work.  I'm using latest dapper, and have tried every possible
permutation of mixer settings.  I either get a quiet hiss or complete
silence.

The sound hardware uses the snd_hda_intel module.  Here's the relevant
lspci output:

$ lspci -vv -s 00:1b.0
0000:00:1b.0 0403: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 03)
        Subsystem: Dell: Unknown device 01b5
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
        Latency: 0, Cache Line Size: 0x10 (64 bytes)
        Interrupt: pin A routed to IRQ 169
        Region 0: Memory at dfebc000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <available only to root>

Googling for this issue suggests that many other people with this
hardware have this problem too, including this cryptic comment:

"""No mic inputs
(updated 20/03/2006)

This is annoying - all of the outputs are doing their thing but not the
inputs... Presently, the mic/line jack appears to be as dead as a
doornail. I reckon this is again due to the way this chipset can re-task
jacks at will, as under windows when you plug a device in it asks you
"is this a MIC or a Line-level device?"... Presently chatting with some
Alsa peeps to see if they have any ideas..."""

(from
http://www.disgruntledgoat.com/content/useful/gentoo_on_inspiron630m.php#nomicinputs)

Other info:

$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1

$ amixer
Simple mixer control 'Master',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono:
  Front Left: Playback 11 [35%] [on]
  Front Right: Playback 11 [35%] [on]
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 255 [100%]
  Front Right: Playback 255 [100%]
Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 15
  Front Left: Capture 15 [100%] [on]
  Front Right: Capture 15 [100%] [on]
Simple mixer control 'Capture Mux',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 4
  Front Left: 4 [100%]
  Front Right: 4 [100%]
Simple mixer control 'Input Source',0
  Capabilities: enum
  Items: 'Mic' 'Line'
  Item0: 'Mic'

Let me know if there's anything else I can do to help diagnose this.

** Affects: linux-source-2.6.15 (Ubuntu)
     Importance: Medium
         Status: Fix Committed

-- 
Microphone does not work on Dell Inspiron 630m
https://launchpad.net/bugs/42600