microphone regression on 4.1

[Jamie Strandboge]

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.

[Seth Forshee (sforshee)]

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 <email address hidden>
  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.

[Seth Forshee (sforshee)]

Upstream commit 831bfdf9520e389357cfeee42a6174a73ce7bdb7 fixes the issue. This should make it to 4.1 via stable, but we can pick it up early to get the fix sooner.

[Jamie Strandboge (jdstrand)]

4.1.0-1.1~rc2-generic from the canonical-kernel-team ppa fixes this for me. Thanks!

$ cat /proc/version_signature
Ubuntu 4.1.0-1.1~rc2-generic 4.1.0

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.1.0-1.1

---------------
linux (4.1.0-1.1) wily; urgency=low

  [ Andy Whitcroft ]

  * SAUCE: overlay: add backwards compatible overlayfs format support V3
    - LP: #1395877, #1410480
  * SAUCE: overlayfs: when copying up and reading directories ensure
    mounter had permissions V2
    - CVE-2015-1328
  * [Packaging] fix up Vcs-Git: to point to launchpad
  * [Config] correct linux-initramfs-tool virtual linkage
    - LP: #1474810

  [ Chris J Arges ]

  * [Config] Add dm-service-time to multipath-modules
    - LP: #1469240
  * [Config] Add MTD_POWERNV_FLASH and OPAL_PRD
    - LP: #1464560

  [ Jay Vosburgh ]

  * SAUCE: fan: Proof of concept implementation (v2)
    - LP: #1439706
  * SAUCE: fan: tunnel multiple mapping mode (v3)
    - LP: #1470091

  [ Leann Ogasawara ]

  * Revert "SAUCE: ext4: disable ext4_punch_hole for indirect filesystems"
  * Revert "SAUCE: intel_pstate: inform user that thermald is worth
    considering"
  * Revert "SAUCE: Work around broken ACPI backlight on Dell Inspiron 5537"
  * Revert "SAUCE: dm-crypt: never use write same"
  * Release Tracking Bug
    - LP: #1476333

  [ Tim Gardner ]

  * Rebase to v4.1
    - LP: #1443371
  * [Config] Enable Apparmor
  * [Config] CONFIG_OVERLAY_FS_V1=y
  * [Config] DEFAULT_IOSCHED="deadline" for ppc64el
    - LP: #1469829
  * [Config] CONFIG_VM86=n
    - LP: #1473447
  * [Config] ACORN_PARTITION=n
    - LP: #1453117

  [ Timo Aaltonen ]

  * [Config] Disable CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT
    - LP: #1473319

  [ Upstream Kernel Changes ]

  * efi: efivar_create_sysfs_entry() should return negative error codes
  * efi: Add esrt support
  * x86, doc: Remove cmdline_size from list of fields to be filled in for
    EFI handover
  * efi/esrt: Fix some compiler warnings
  * efi: dmi: List SMBIOS3 table before SMBIOS table
  * efi: Add 'systab' information to Documentation/ABI
  * ALSA: hda - restore the MIC FIXUP for some Dell machines
    - LP: #1473560
  * mtd: powernv: Add powernv flash MTD abstraction driver
    - LP: #1464560
  * powerpc/powernv: Expose OPAL APIs required by PRD interface
    - LP: #1464560
  * powerpc/powernv: Add opal-prd channel
    - LP: #1464560
  * powerpc/powernv: fix construction of opal PRD messages
    - LP: #1464560
  * powerpc/include: Add opal-prd to installed uapi headers
    - LP: #1464560
  * powerpc/powernv: Fix vma page prot flags in opal-prd driver
    - LP: #1464560

 -- Leann Ogasawara <email address hidden> Mon, 20 Jul 2015 10:16:06 -0700