[alsa-devel] Microphone Not Working after Suspend on Apple MacBookAir5, 2 Cirrus Logic CS4206

[Takashi Iwai]

At Thu, 12 Mar 2015 20:13:05 +0100,
Vasil Zlatanov wrote:
> 
> Applied both patches against 3.18.6-1 and correctly resolved all
> issues.

Good to hear, I queued both patches now.  They'll be backported to
stable kernels once when merged to upstream.


thanks,

Takashi

> 
> On Thu, Mar 12, 2015 at 11:38:39AM +0100, Takashi Iwai wrote:
> > At Wed, 11 Mar 2015 23:26:00 +0100,
> > Vasil Zlatanov wrote:
> > > 
> > > Issue as seen on reddit thread:
> > > https://www.reddit.com/r/linux/comments/1kccbk/alsa_bug_driving_me_crazy_please_help/
> > > 
> > > A common problem for Apple Macbook Air 5.2 users where microphone does 
> > > not work after system resume. As users have noted microphone starts 
> > > working ones again when the volume is changed in alsa-mixer. 
> > > 
> > > alsa-info dumps are attached showing before and after being adjusted
> > > (where before causes microphone not to work while in after it does)
> > > 
> > > IRC user 'debianuser' kindly helped out and found that using the two
> > > following commands fix the issue:
> > > 
> > > amixer -cPCH set "Capture" 0% nocap 
> > > amixer -cPCH set "Capture" 100% cap                                      
> > > 
> > > In my experience both are required and they seem to have the same effect
> > > as manually changing the volume level in alsamixer, and as such resolve
> > > the issue (until another suspend when they have to be run again).
> > 
> > This might be due to the single ADC amp.  The ADC widgets have
> > multiple inputs and usually they have individual amp volumes.  But
> > some codecs give only a single volume for all inputs.
> > 
> > There is a flag in the driver to change the control for that.  The
> > patch below enables it.
> > 
> > diff --git a/sound/pci/hda/patch_cirrus.c b/sound/pci/hda/patch_cirrus.c
> > index 1589c9bcce3e..dd2b3d92071f 100644
> > --- a/sound/pci/hda/patch_cirrus.c
> > +++ b/sound/pci/hda/patch_cirrus.c
> > @@ -584,6 +584,7 @@ static int patch_cs420x(struct hda_codec *codec)
> >  		return -ENOMEM;
> >  
> >  	spec->gen.automute_hook = cs_automute;
> > +	codec->single_adc_amp = 1;
> >  
> >  	snd_hda_pick_fixup(codec, cs420x_models, cs420x_fixup_tbl,
> >  			   cs420x_fixups);
> > 
> > Alternatively, you can pass "single_adc_smp = true" hint in the
> > firmware patch passed via patch option.  See
> > Documentation/sound/alsa/HD-Audio.txt for details.
> > 
> > 
> > > As of now I'm resolving this issue by creating a service that is to run
> > > after resume from susspend with the given amixer commands to renable the
> > > microphone.
> > > 
> > > The second issue, which is also in the reddit thread, is that the
> > > microphine is mono and when recording only right channel audio is seen.
> > > For me this broke programs such as mumble and skype.
> > > 
> > > A alsa-info output with coefficients is attached.
> > > 
> > > 'debianuser' managed to find a solution to this issue well, resolving it
> > > by running the following two commands:
> > > 
> > > hda-verb /dev/snd/hwC0D0 0x11 SET_COEF_INDEX 2
> > > hda-verb /dev/snd/hwC0D0 0x11 SET_PROC_COEF 0x102a
> > > 
> > > After one runs them a single time after boot, the channels collectly
> > > show and programs issues are resolved. 'debianuser' mentions that the
> > > sources for the commands are available in the kernel and applied to the
> > > macbook 8.1 model, but not to mine.
> > 
> > Yes, it's the very same workaround for MBP8,1.  You can pass
> > model=mbp81 option.  If it works, you can just add a sline to
> > cs420x_fixup_tbl[] something like
> > 
> > @@ -393,6 +393,7 @@ static const struct snd_pci_quirk cs420x_fixup_tbl[] = {
> >  	SND_PCI_QUIRK(0x106b, 0x1c00, "MacBookPro 8,1", CS420X_MBP81),
> >  	SND_PCI_QUIRK(0x106b, 0x2000, "iMac 12,2", CS420X_IMAC27_122),
> >  	SND_PCI_QUIRK(0x106b, 0x2800, "MacBookPro 10,1", CS420X_MBP101),
> > +	SND_PCI_QUIRK(0x106b, 0x5600, "MacBookAir 5,2", CS420X_MBP81),
> >  	SND_PCI_QUIRK(0x106b, 0x5b00, "MacBookAir 4,2", CS420X_MBA42),
> >  	SND_PCI_QUIRK_VENDOR(0x106b, "Apple", CS420X_APPLE),
> >  	{} /* terminator */
> > 
> > 
> > 
> > Takashi
> [2  <application/pgp-signature (7bit)>]
>