The upstream 4.9-rc1 kernel has been released. It includes the patch I
mentioned in comment #6 as commit
0eec880966e77bdbee0112989a2be67d92e39929. This patch is also in the
upstream 4.4.24 kernel as commit

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

Status in linux package in Ubuntu:

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
   /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 
  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" 
   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) 08/19/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F.25
  dmi.board.asset.tag: Base Board Asset Tag 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:bvnAmericanMegatrendsInc.:bvrF.25:bd08/19/2015:svnHewlett-Packard:pnHPSpectrex360Convertible13:pvr:rvnHewlett-Packard:rn802D:rvr58.39:cvnHewlett-Packard:ct10:cvrChassisVersion: HP Spectre x360 Convertible 13
  dmi.sys.vendor: Hewlett-Packard

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