[alsa-devel] No sound from internal speaker on 2013 Macbook Air 6, 1

Ben Whitten ben.whitten at gmail.com
Mon Sep 16 11:44:27 CEST 2013

> > > OK, then the normal jack detection doesn't work with this machine, as
> > > it seems.  You can try the above to all pins for checking if any of
> > > other pins reacts to the headphone jack.
> >
> > No luck I'm afraid - none of the other pins seem to react to the
> > headphones. Is there anything else you can think of that I can try
> > tomorrow?
> Well, it might be notified via GPIO.  Try to read GPIO pins except for
> GPIO0.  That is, set the all unmasked, the direction to READ.

We have found that jack sense comes in on the headphone pin in a windows
bootcamp install. However this bit isn't set in linux using either the
default chip, bootloader, or windows pin configs. No other GPIO's are
enabled in windows.


More information about the Alsa-devel mailing list