[alsa-devel] snd-hda-intel : issues with mic boost on ALC3236

[Kailang]

> -----Original Message-----
> From: Takashi Iwai [mailto:tiwai at suse.de] 
> Sent: Thursday, April 30, 2015 1:23 PM
> To: Simon Derr
> Cc: Kailang; alsa-devel at alsa-project.org
> Subject: Re: [alsa-devel] snd-hda-intel : issues with mic 
> boost on ALC3236
> 
> At Wed, 29 Apr 2015 22:26:39 +0200,
> Simon Derr wrote:
> > 
> > >> I'm having issues with the internal microphone on an 
> Asus R553 (or S551) laptop.
> > >>
> > >> With the boost set to zero the microphone works but the level of 
> > >> the recording is very low.
> > >> If I try another boost setting I don't get any signal anymore.
> > 
> > > The problem is unlikely specific to the codec (ALC3236) but the 
> > > whole hardware implementation.
> > 
> > I have to admit that I have zero knowledge of how these things are 
> > implemented. I can't find a datasheet for that codec anywhere.
> > However, looking at the ALC262 datasheet for instance, the block 
> > diagram represents the boost function inside the codec itself.
> 
> ALC3236 isn't ALC262 but rather ALC269 variant.
> 
> Kailang, is there anything special in ALC3236 regarding the 
> mic boost handling?  Here, the problem is that the machine 
> doesn't get builtin mic working when mic boost is set more 
> than 0, and 0 gives only low signals.  alsa-info.sh is at:
>   
> http://www.alsa-project.org/db/?f=55b7fb0b4998757d099addae0a41
1e6a7cebc079
> 

I ever met this issue before. But I forgot which cause this issue.
Maybe some hidden registers need to be changed.
I will ask our AE for this. 

> > > Your hardware seems to have only one mic pin.  It's 
> already strange.
> > > Usually there are two mic pins.  Did you try the input 
> from mic jack
> > > (or headset mic)?   Did it work with mic boot volume properly?
> > 
> > I just tried : plugging a headset in the combo jack does 
> not seem to 
> > have any effect on the mic input. It seems that the mic on 
> the headset 
> > is not used, and that the internal microphone of the laptop 
> is still 
> > active.
> 
> So you have two problems.  Not sure whether it's related, though.
> 
> You may try some existing quirk for Dell laptops, e.g. 
> model=dell-headset-multi.  In your case, the realtek codec is 
> the second one, so pass "model=,dell-headset-multi" (give a 
> comma at first)
> 
> 
> Takashi
> 
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