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On ubuntu trusty, Audio driver on HP Spectre x360 doesn't work.

May be related to the bug found on the 2015 XPS 13.
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1413446)

On the kernel 4.0-rc4+ given as solution for the bug found on the XPS 13, the
dmesg -t | egrep "(audio|snd|INT3438)" command return:

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: 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
---
ApportVersion: 2.14.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  isatis     1479 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=1e13c664-5747-48ed-942c-18c0610b50dd
InstallationDate: Installed on 2015-04-01 (12 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
MachineType: Hewlett-Packard HP Spectre x360 Convertible 13
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-34-generic.efi.signed root=UUID=70117e8f-97a5-40f7-90fd-aa25fdba1bba ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.16.0-34.45~14.04.1-generic 3.16.7-ckt8
RelatedPackageVersions:
 linux-restricted-modules-3.16.0-34-generic N/A
 linux-backports-modules-3.16.0-34-generic  N/A
 linux-firmware                             1.127.11
Tags:  trusty
Uname: Linux 3.16.0-34-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 02/05/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F.11
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 802D
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 58.25
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF.11:bd02/05/2015:svnHewlett-Packard:pnHPSpectrex360Convertible13:pvr:rvnHewlett-Packard:rn802D:rvr58.25:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP Spectre x360 Convertible 13
dmi.sys.vendor: Hewlett-Packard

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux (Fedora)
     Importance: Unknown
         Status: Unknown


** Tags: apport-collected bios-outdated-f.12 kernel-bug-exists-upstream-4.0 needs-upstream-testing trusty ubuntu vivid
-- 
[HP Spectre x360 - 13-4010ca] Audio broken, broadwell-U audio controller
https://bugs.launchpad.net/bugs/1441852
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