[alsa-devel] hda question: 'Headphone Playback Switch' cannot unmute the pin's output amplifier?

[David Henningsson]

On 06/05/2013 01:06 PM, Lin, Mengdong wrote:
> Hi,
>
> I'm using a Realtek HD-A codec ALC282. But the headphone output amplifier is always muted and I cannot unmute it by amixer.
>
> I tried to unmute the pin via control 'Headphone Playback Switch', but snd_hda_mixer_amp_switch_put() gets a ZERO value from ucontrol->value.integer.value, thus the pin will be muted.
> Could somebody give me some tips to further check this issue? Many thanks!

Maybe there's also a "Master playback switch" that needs to be turned on 
as well?

>
> Here are the headphone pin info:
> Node 0x21 [Pin Complex] wcaps 0x40058d: Stereo Amp-Out
>    Control: name="Headphone Playback Switch", index=0, device=0
>      ControlAmp: chs=3, dir=Out, idx=0, ofs=0
>    Control: name="Headphone Jack", index=0, device=0
>    Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
>    Amp-Out vals:  [0x80 0x80]
>    Pincap 0x0000001c: OUT HP Detect
>    Pin Default 0x0321401f: [Jack] HP Out at Ext Left
>      Conn = 1/8, Color = Green
>      DefAssociation = 0x1, Sequence = 0xf
>    Pin-ctls: 0xc0: OUT HP
>    Unsolicited: tag=01, enabled=1
>    Power states:  D0 D1 D2 D3 EPSS
>    Power: setting=D0, actual=D0
>    Connection: 2
>       0x0c 0x0d*
>
> Here is the pin's controls listed by amixer:
> numid=2,iface=MIXER,name='Headphone Playback Switch'
>
> Then I use this command to unmute the pin's amplifier:
> amixer -c 1 cset numid=2,iface=MIXER,name='Headphone Playback Switch' on
>
> My debug message show that snd_hda_mixer_amp_switch_put() gets zero value , indicating to 'mute':
> [  346.263519] snd_hda_mixer_amp_switch_put: nid 0x0021, chs 3, control value [0x00000000, 0x00000000]
> [  346.263527] snd_hda_codec_amp_update: nid 0x0021
> [  346.263532] codec_amp_update: nid 0x0021, ch 0, direction 1 (OUT 1), index 0, val 0x00000080
> [  346.263536] codec_amp_update: amp val not change
> [  346.263538] snd_hda_codec_amp_update: nid 0x0021
> [  346.263542] codec_amp_update: nid 0x0021, ch 1, direction 1 (OUT 1), index 0, val 0x00000080
> [  346.263544] codec_amp_update: amp val not change
>
> Thanks
> Mengdong
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-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic