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[Kyle Echols <kyleechols@xxxxxxxxx>]

I have booted through the following kernels, with the results listed: 
Current -RC build - works 
3.12.6-trusty - works 
3.12.5-trusty - works 
3.12.4-trusty - wouldn't boot, No init found -- confirmed boot settings matched working 3.8 kernels in grub configs, ran update-grub, still didn't boot 
3.12.3-trusty - works 
3.12.0-saucy  - works 

Please let me know if I need to continue testing further back.

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https://bugs.launchpad.net/bugs/1265947

Title:
  046d:c52b [XFX MI-A78S-8209] USB keyboard and mouse not detected with
  newer kernels

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I have a Logitech wireless keyboard/mouse combo that uses a unifying
  receiver ([Logitech Unifying Device. Wireless PID:101b). Using
  Mythbuntu 12.04.3, fully patched, kernel version 3.8.0-35-generic the
  receiver, keyboard, and mouse all function correctly. Using ubuntu
  14.04 (12/28 Daily) and 13.10, these devices do not work reliably.
  Sometimes they are not available after a reboot, other times, they
  will just stop responding after not being used for a few minutes. In
  either case, at least one reboot is required to get the keyboard and
  mouse to be detected and work again.  I found this issue while
  troubleshooting a separate bug, 1264636
  (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1264636), from
  the research I've done, this appears to be similar to
  https://bugzilla.kernel.org/show_bug.cgi?id=60507

  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.12.0-7-generic 3.12.0-7.15
  ProcVersionSignature: Ubuntu 3.12.0-7.15-generic 3.12.4
  Uname: Linux 3.12.0-7-generic x86_64
  ApportVersion: 2.12.7-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     2907 F.... pulseaudio
  CasperVersion: 1.336ubuntu1
  Date: Sat Jan  4 00:51:35 2014
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131228)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.12.0-7-generic N/A
   linux-backports-modules-3.12.0-7-generic  N/A
   linux-firmware                            1.117
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/05/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 080015
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: MI-A78S-8209
  dmi.board.vendor: XFX
  dmi.board.version: Ver1.1
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080015:bd01/05/2009:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnXFX:rnMI-A78S-8209:rvrVer1.1:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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