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[Daniel Letzeisen <1255370@xxxxxxxxxxxxxxxxxx>]

** Also affects: alsa-driver (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1255370

Title:
  MacBookPro11,1 (Late 2013 Haswell) has no sound

Status in “alsa-driver” package in Ubuntu:
  New
Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  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

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