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[Max Waterman <ubuntuone@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

I am currently running with that kernel :

[~]$ uname -ar
Linux mwaterm1-x250 4.6.0-040600rc6-generic #201605012031 SMP Mon May 2 00:33:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
[~]$ 

The problem now doesn't occur, but I'm am uncertain if it is because of
the kernel (and any fix in it) or the symlink I made as per comment #3.
I could quite believe that the symlink workaround could fix a variety of
problems, but there were several issues in the upgrade and the first
thing I was told to do was to upgrade the kernel.

I'm happy to defer to your own judgement on that. If you think this
issue is fixed (I mean the actual problem, not just for my case), then I
have no problem with you closing this.

-- 
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1575261

Title:
  volume/mute keys no longer work

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  After upgrading from 15.10 to 16.04, my volume keys no longer work. In
  15.10, pressing the volume up/down resulted in the volume going
  up/down as indicated in the applet in the top menu, accompanied by a
  blip. Since upgrading, there is no response to the keys.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  davidmaxwaterman   2348 F.... pulseaudio
   /dev/snd/controlC0:  davidmaxwaterman   2348 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Apr 26 17:27:24 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=f6a6d0a5-8059-4f25-9b03-f560ceb68f6d
  InstallationDate: Installed on 2015-05-20 (342 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: LENOVO 20CM001QUK
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (4 days ago)
  dmi.bios.date: 04/06/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N10ET33W (1.12 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20CM001QUK
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN10ET33W(1.12):bd04/06/2015:svnLENOVO:pn20CM001QUK:pvrThinkPadX250:rvnLENOVO:rn20CM001QUK:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20CM001QUK
  dmi.product.version: ThinkPad X250
  dmi.sys.vendor: LENOVO

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