Yom - can you confirm what Bastien said in comment #5 about kernel 4.4?
If not, he probably has different hardware to yours.

Can you also please test the 4.9-rc1 kernel when it is available at 
It contains the following commit:

ALSA: hda - Add the top speaker pin config for HP Spectre x360

HP Spectre x360 with CX20724 codec has two speaker outputs while the
BIOS sets up only the bottom one (NID 0x17) and disables the top one
(NID 0x1d).

This patch adds a fixup simply defining the proper pincfg for NID 0x1d
so that the top speaker works as is.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=169071
Cc: <sta...@vger.kernel.org>
Signed-off-by: Takashi Iwai <ti...@suse.de>

** Bug watch added: Linux Kernel Bug Tracker #169071

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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)
  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.product.name: HP Spectre x360 Convertible 13
  dmi.sys.vendor: Hewlett-Packard

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