[alsa-devel] [PATCH] ALSA: hda - Remove ignore_misc_bit

Raymond Yau superquad.vortex2 at gmail.com
Wed Sep 19 02:35:19 CEST 2012

>>> do you mean the commit does not fix the bug?
>>> ALSA: hda - add support for Uniwill ECS M31EI notebook
>>> This hardware requires same fixup for the node 0x0f like Asus A6Rp.
>>> More information: https://bugzilla.redhat.com/show_bug.cgi?id=785417
> The PCI SSIDs are different, so I don't think that commit will affect the
bug I was trying to fix.

How many audio jacks do this m31ei have as
JrZabott specified model=3stack(3 jacks) which use cd pin , no auto Mic
since this input source also does not support jack detect.

Node 0x11 [Pin Complex] wcaps 0x400001: Stereo
  Pincap 0x00000063: IN Balanced Trigger ImpSense
  Pin Default 0x99331121: [Fixed] CD at Int ATAPI
    Conn = ATAPI, Color = Black
    DefAssociation = 0x2, Sequence = 0x1
    Misc = NO_PRESENCE
  Pin-ctls: 0x00:

The master playback switch is at audio mixer node 0x16

Simple mixer control 'Master',0
  Capabilities: pswitch penum
  Playback channels: Front Left - Front Right
  Front Left: Playback [on]
  Front Right: Playback [on]
Simple mixer control 'PCM',0
  Capabilities: pvolume penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Front Left: Playback 255 [100%] [0.00dB]
  Front Right: Playback 255 [100%] [0.00dB]

There is no  headphone playback volume/switch so why do pulseaudio remove
the analog output path ?

analog-output-headphones: Headphones (priority 9000, available: no)

active port: <analog-output-headphones>

There are mini itx chassis which does not have front audio panel, will
pulseaudio remove the analog output path ?

Default PCM:
    rates [0x140]: 48000 96000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
Default Amp-In caps: N/A
Default Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1

Refer to the block diagram of alc861 datasheet, it seem every audio output
and pin complex has a mute switch

And you already mentioned there is no speaker pin

>>> the real cases are those desktop which does not use hda front audio
panel ,
>>> they just loss the auto mute since there is no jack detect circuit but
>>> can still hear sound from the headphone at anytime
> If there is an AC'97 front panel connected, the BIOS should set
NO_PRESENCE in the misc bit.

Do you mean the driver should a read/write kcontrol so that user can change
the state by qashctl ?

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