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[Bastien <bkerysaouen@xxxxxxxxx>]

Kernel 4.4.0-040400rc8-generic appears to fix the issue, without having
to modify the GRUB.

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https://bugs.launchpad.net/bugs/1505067

Title:
  [HP Spectre x360 - 13-4001nf] Audio broken, broadwell-U audio
  controller

Status in linux package in Ubuntu:
  Triaged

Bug description:
  On Ubuntu vivid (15.04), Audio driver on HP Spectre x360 doesn't work.

  WORKAROUND: GRUB can be reconfigured to use the sound card in legacy (HDA) mode by:
  1) Editing /etc/default/grub
  2) replacing GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" by GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor acpi_osi='!Windows 2013' acpi_osi='!Windows 2012'"
  3) Rebooting TWO times

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-30-generic 3.19.0-30.34
  ProcVersionSignature: Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6
  Uname: Linux 3.19.0-30-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  yom        1908 F.... pulseaudio
   /dev/snd/controlC1:  yom        1908 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Oct 12 10:49:27 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-17 (86 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: Hewlett-Packard HP Spectre x360 Convertible 13
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-30-generic root=UUID=fabc8684-f690-4eeb-ad0a-ec14846f7de6 ro quiet splash acpi_backlight=vendor "acpi_osi=!Windows 2013" "acpi_osi=!Windows 2012" vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-30-generic N/A
   linux-backports-modules-3.19.0-30-generic  N/A
   linux-firmware                             1.143.3
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-07-24 (79 days ago)
  dmi.bios.date: 08/19/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F.25
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 802D
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 58.39
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF.25:bd08/19/2015:svnHewlett-Packard:pnHPSpectrex360Convertible13:pvr:rvnHewlett-Packard:rn802D:rvr58.39:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP Spectre x360 Convertible 13
  dmi.sys.vendor: Hewlett-Packard

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