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[Max Waterman <ubuntuone@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

I can't reproduce this any more, using :

4.6.0-994-generic

I switch to the above kernel because I was seeing this problem (well,
the volume keys weren't working) with this kernel :

4.6.0-040600rc6-generic

I'm not entirely sure what's changed/what the difference is. My laptop
boots to the latter one by default...I tried 'lock' and 'suspend' (from
menu and also by closing/opening the laptop), and it still worked
afterwards.

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https://bugs.launchpad.net/bugs/1554371

Title:
  [Regression] Volume keys not working after suspend/resume

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have a Microsoft Sculpt Ergonomic Desktop (keyboard/mouse combo). It
  was working great with Ubuntu 15.10. After upgrading to 16.04, the
  media keys stop working after suspending and resuming. This seems to
  be the relevant error from Xorg.log:

  [   176.121] (EE) evdev: Microsoft Microsoft® 2.4GHz Transceiver v9.0:
  Unable to open evdev device "/dev/input/event6".

  The USB receiver creates 5 devices:

  lrwxrwxrwx 1 root root   9 Mar  7 20:17 usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v9.0-event-kbd -> ../event4
  lrwxrwxrwx 1 root root   9 Mar  7 20:17 usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v9.0-if01-event-mouse -> ../event5
  lrwxrwxrwx 1 root root   9 Mar  7 20:17 usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v9.0-if01-mouse -> ../mouse1
  lrwxrwxrwx 1 root root   9 Mar  7 20:17 usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v9.0-if02-event-kbd -> ../event6
  lrwxrwxrwx 1 root root   6 Mar  7 20:17 usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v9.0-if02-kbd -> ../js0

  After suspending and resuming, the last 2 devices (event6 and js0)
  disappear.

  I have tried booting up into the Vivid and Trusty kernels, and the
  problem persists, so at first glance it doesn't seem to be an issue
  with the kernel.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-4-generic 4.4.0-4.19
  ProcVersionSignature: Ubuntu 4.4.0-4.19-generic 4.4.1
  Uname: Linux 4.4.0-4-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  furkan     2733 F.... pulseaudio
   /dev/snd/controlC1:  furkan     2733 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Mar  7 20:17:56 2016
  HibernationDevice: RESUME=UUID=a8eb7091-e848-4e63-82a1-8fa9562a3a61
  InstallationDate: Installed on 2014-06-06 (640 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Gigabyte Technology Co., Ltd. GA-970A-D3
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-4-generic root=UUID=d254b01f-2bf2-4b57-acdc-c796786f4c4c ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-4-generic N/A
   linux-backports-modules-4.4.0-4-generic  N/A
   linux-firmware                           1.156
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-01-04 (63 days ago)
  dmi.bios.date: 05/30/2012
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F10
  dmi.board.name: GA-970A-D3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF10:bd05/30/2012:svnGigabyteTechnologyCo.,Ltd.:pnGA-970A-D3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-970A-D3:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-970A-D3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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