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[chris lea <chris.lea@xxxxxxxxx>]

As far as I can tell I'm seeing the same sort of problem with a clean
install of Ubuntu Mate 16.04 on my Dell XPS 13 9343.

>From what I can tell, the machine thinks it's playing audio. If you look
at the input tab of the sound preferences when a youtube video is
playing, it's clearly processing something. But no sound ever comes out
of the speakers. Also, if I plug speakers into the headphone jack, it
results in a high pitched whine which is constant and persists even if I
mute everything.

Happy to provide any additional info if I can.

Attaching the output of alsa-info.sh.

** Attachment added: "alsa-info.txt"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1551880/+attachment/4660918/+files/alsa-info.txt

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https://bugs.launchpad.net/bugs/1551880

Title:
  [Dell XPS 13 9343] Audio broken with I2S mode in Ubuntu 16.04 kernel
  4.4 (but works with kernel 4.3)

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I wanted to try Linux again on this machine and the tons of
  troubleshooting since release got a bit better, but the sound is still
  a bit strange.

  So after changing distributions I installed Xubuntu 16.04 Beta 1 today with kernel 4.4.0-8 and sound isn't working because the 3,5 mm device is completely missing. PulseAudio is only showing the HDMI output. 
  I got the sound working by downloading kernel 4.3.6 from the Ubuntu kernel archives, although then it looks like it is running in HDA mode instead of I2S (which I don't like because Dual Boot).

  Let me know if there is anything else I can do to track down the
  problem.

  $ 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)
  sst-acpi INT3438:00: DesignWare DMA Controller, 8 channels
  haswell-pcm-audio haswell-pcm-audio: Direct firmware load for intel/IntcPP01.bin failed with error -2
  haswell-pcm-audio haswell-pcm-audio: fw image intel/IntcPP01.bin not available(-2)
  haswell-pcm-audio haswell-pcm-audio: FW loaded, mailbox readback FW info: type 01, - version: 00.00, build 77, source commit id: 876ac6906f31a43b6772b23c7c983ce9dcb18a19
  broadwell-audio broadwell-audio: ASoC: CODEC DAI rt286-aif1 not registered
  snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
  broadwell-audio broadwell-audio: ASoC: CODEC DAI rt286-aif1 not registered
  broadwell-audio broadwell-audio: ASoC: CODEC DAI rt286-aif1 not registered
  broadwell-audio broadwell-audio: ASoC: CODEC DAI rt286-aif1 not registered
  broadwell-audio broadwell-audio: ASoC: CODEC DAI rt286-aif1 not registered
  broadwell-audio broadwell-audio: ASoC: CODEC DAI rt286-aif1 not registered
  broadwell-audio broadwell-audio: ASoC: CODEC DAI rt286-aif1 not registered

  $ cat /proc/asound/cards
   0 [HDMI           ]: HDA-Intel - HDA Intel HDMI
                        HDA Intel HDMI at 0xf7218000 irq 50

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-8-generic 4.4.0-8.23
  ProcVersionSignature: Ubuntu 4.4.0-8.23-generic 4.4.2
  Uname: Linux 4.4.0-8-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sysop      1266 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Tue Mar  1 18:48:05 2016
  HibernationDevice: RESUME=UUID=338a51e1-7748-466e-ba21-4210b34c4189
  InstallationDate: Installed on 2016-03-01 (0 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224)
  MachineType: Dell Inc. XPS 13 9343
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-8-generic.efi.signed root=UUID=347e6152-7230-486c-b801-8eb0811c8c8d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-8-generic N/A
   linux-backports-modules-4.4.0-8-generic  N/A
   linux-firmware                           1.156
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/11/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0WF2C3
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd11/11/2015:svnDellInc.:pnXPS139343:pvr:rvnDellInc.:rn0WF2C3:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.sys.vendor: Dell Inc.

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