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[Launchpad Bug Tracker <1255370@xxxxxxxxxxxxxxxxxx>]

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I installed Ubuntu 13.10 on a new MacBook Pro (Late 2013, 13-inch
Haswell retina).  The speakers did not work after installation, and
after I fixed it, it would not work after suspend.  It turns out some of
the flags were not set correctly.  I can fix these problems but it would
be nice to have them fixed at installation.

The problem can be seen in the GPIO section in
/proc/asound/card1/codec#0 (card0 is for HDMI).  After boot, the GPIO
flags for IO[0] were

GPIO: io=6, o=2, i=0, unsolicited=1, wake=1
  IO[0]: enable=1, dir=1, wake=0, sticky=0, data=0, unsol=0

If data were set to 1, sound would work!  I fixed this by installing
alsa-tools and adding to /etc/rc.local a line:

hda-verb /dev/snd/hwC1D0 0x1 set_gpio_data 1

After resuming from suspend, the GPIO flags for IO[0] became

GPIO: io=6, o=2, i=0, unsolicited=1, wake=1
  IO[0]: enable=0, dir=0, wake=0, sticky=0, data=0, unsol=0

Here, three flags were set to 0.  I fixed this by adding to
/etc/pm/sleep.d/99_myfix a few lines:

#!/bin/sh
case "$1" in
	resume|thaw)
		hda-verb /dev/snd/hwC1D0 0x1 set_gpio_mask 1
		sleep 1
		hda-verb /dev/snd/hwC1D0 0x1 set_gpio_direction 1
		sleep 1
		hda-verb /dev/snd/hwC1D0 0x1 set_gpio_data 1
		;;
esac

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
MacBookPro11,1 (Late 2013 Haswell) has no sound
https://bugs.launchpad.net/bugs/1255370
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