Comment 0 for bug 1473560

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.

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.