[alsa-devel] No sound on MacbookPro 13,3 (A1707)

[Takashi Iwai]

On Mon, 26 Feb 2018 16:05:34 +0100,
Freaky wrote:
> 
> Hi there,
> 
> we're trying to get sound working on a MacbookPro 13,3 (A1707).
> 
> So far I've been unable to get the sound working. Did use the HDA analyzer
> and flipped the out-dir, enable and data on all 8 GPIO's, but none of them
> got the sound working on either the onboard speakers nor the jack output
> for headphone.
> 
> Is there anyone willing to help on this issue? Driver development is a bit
> beyond my skills. I can provide hands, debug logs, etc. tho' :).
> 
> Currently trying with a default Ubuntu 17.10.1 live USB, but a 4.15.3
> kernel didn't help either.
> 
> Alsa-info has been uploaded to
> http://www.alsa-project.org/db/?f=33cc432d3b648d1aa6adc997630817046656a086
> 
> The system was booted with an external USB-C dock from Dell, otherwise
> there's no network and no regular (USB-A) ports available (booting from
> stick) as the WiFi doesn't work and the device has only USB-C ports. The
> card 0 is from the dock - it's not relevant (and working).
> 
> Before alsa-info ran there was also a USB headphone plugged in, that was
> card 1. Without those devices card 2 = 0 and 3 = 1 at boot. Issues are with
> what's listed as card 2 currently, the HDA-Intel - HDA Intel PCH.
> 
> Any help is greatly appreciated.
> 
> Some people already have some trackers for the current state of the
> devices. Not sure if they are of use, but might help:
> https://github.com/Dunedan/mbp-2016-linux/
> https://gist.github.com/roadrunner2/1289542a748d9a104e7baec6a92f9cd7

The machine has a still unknown codec from Cirrus, possibly CS8409.
And IIRC we had some thread for debugging a similar Mac in the past,
but in vain.

Usually Apple implements some non-standard things, e.g. controlling
via VREF on an unused pin.  So try to find out some information on
other OS.


Takashi