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[Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>]

I've found a couple of times that my audio wasn't working when going
back to HDA mode after using I2S mode. I can get it back by opening a
terminal, launching alsamixer, pressing F6 and selecting the "HDA Intel
PCH" device, then using the up or down arrow to adjust the master gain.

I have no idea why this is necessary, but after doing it once it isn't
needed on subsequent reboots (unless I've changed to using I2S audio in
the interim).

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https://bugs.launchpad.net/bugs/1413446

Title:
  Audio broken on 2015 XPS 13 (9343) in I2S mode in Ubuntu 14.10/15.04

Status in Dell Sputnik:
  Invalid
Status in HWE Next Project:
  Invalid
Status in linux package in Ubuntu:
  Won't Fix
Status in linux package in Fedora:
  Unknown

Bug description:
  (This is a public bug report for LP1402828.)

  This system has a dual-mode audio with an HDA and an I2S interface.
  Which shows up depends on the reported _OSI from the last cold boot.
  Since the kernels in Ubuntu 14.10/15.04 (15.04 uses 3.18 currently)
  report an _OSI of "Windows 2013", I2S mode is used for audio.

  A workaround is to pass acpi_os="!Windows 2013" as a kernel parameter,
  but this is non-optimal since the mode of the touchpad is affected. It
  also results in an alternate, less used and tested path in the
  firmware to be used.

  See the attached dmesg log for details on where the failure happens.
  Notably,

  $ dmesg -t | egrep "(audio|snd|INT3438)"
  dmar: ACPI device "INT3438:00" under DMAR at fed91000 as 00:13.0
  snd_hda_intel 0000:00:03.0: enabling device (0000 -> 0002)
  snd_hda_intel 0000:00:03.0: irq 50 for MSI/MSI-X
  haswell-pcm-audio haswell-pcm-audio: error: ADSP boot timeout
  broadwell-audio broadwell-audio: ASoC: CPU DAI System Pin not registered
  platform broadwell-audio: Driver broadwell-audio requests probe deferral

  There's also a failure to load the codec firmware after a
  suspend/resume.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.18.0-9-generic 3.18.0-9.10
  ProcVersionSignature: Ubuntu 3.18.0-9.10-generic 3.18.2
  Uname: Linux 3.18.0-9-generic x86_64
  ApportVersion: 2.15.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jared      2139 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Jan 21 20:47:40 2015
  HibernationDevice: RESUME=UUID=af18bf4f-1453-4c8c-8b8e-abdc5d4e0674
  InstallationDate: Installed on 2014-11-03 (80 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 0c45:670c Microdia 
   Bus 001 Device 003: ID 04f3:2051 Elan Microelectronics Corp. 
   Bus 001 Device 002: ID 8087:0a2a Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 13 9343
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.18.0-9-generic root=/dev/mapper/ubuntu--vg-root ro video.use_native_backlight=1 video.use_native_backlight=1
  RelatedPackageVersions:
   linux-restricted-modules-3.18.0-9-generic N/A
   linux-backports-modules-3.18.0-9-generic  N/A
   linux-firmware                            1.141
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-01-08 (14 days ago)
  dmi.bios.date: 11/04/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  dmi.board.name: 0144PA
  dmi.board.vendor: Dell Inc.
  dmi.board.version: X04
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA00:bd11/04/2014:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0144PA:rvrX04:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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