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[Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>]

We had both of those commits backported in vivid, but it seems they got
lost when rebasing onto 4.0, so that accounts for the regression there.

In 4.1 the commits are there, but it seems this commit causes a
regression:

  commit 82d6d8a4034a7480d582791763c89c328c2a8f0c
  Author: Takashi Iwai <tiwai@xxxxxxx>
  Date:   Mon Jun 15 20:36:12 2015 +0200

      ALSA: hda - Fix noisy outputs on Dell XPS13 (2015 model)

I'll report this bug upstream.

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Seth Forshee (sforshee)

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https://bugs.launchpad.net/bugs/1473560

Title:
  microphone regression on 4.1

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On my Dell XPS 13 9343, the microphone works fine with the vivid kernel. However, it does not work with the current 4.0 wily kernel unless I patch it with these commits:
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit?id=e1e62b98ebddc3234f3259019d3236f66fc667f8
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit?id=f3b703326541d0c1ce85f5e570f6d2b6bd4296ec

  For unrelated reasons, I decided to try the wily 4.1 kernel found
  here: https://launchpad.net/~canonical-kernel-
  team/+archive/ubuntu/ppa/. The microphone doesn't work even though
  Leann Ogasawara confirmed that the above two patches are included
  upstream.

  Note I am running vivid userspace, the 4.1 wily kernel from the ppa,
  bcmwl-kernel-source from wily (since there is a dkms fix) and linux-
  firmware from wily.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-4.1.0-1-generic 4.1.0-1.1~dogfoodv1 [origin: unknown]
  ProcVersionSignature: Ubuntu 4.1.0-1.1~dogfoodv1-generic 4.1.0
  Uname: Linux 4.1.0-1-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Jul 10 16:10:53 2015
  HibernationDevice: RESUME=UUID=27fa6713-c8c2-4eb8-9766-ba6918bc1cfb
  InstallationDate: Installed on 2015-06-13 (26 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. XPS 13 9343
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.1.0-1-generic root=UUID=7bc4dcd2-0bd8-4e42-b8b7-9f1ed6b8a3e9 ro libata.force=noncq kaslr quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.1.0-1-generic N/A
   linux-backports-modules-4.1.0-1-generic  N/A
   linux-firmware                           1.145
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/15/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 0310JH
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA04:bd05/15/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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