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[kklaine <kklaine@xxxxxxxxx>]

I appear to have the same behavior with a Logitech K520 Keyboard. I was
expecting an upgrade to 14.10 to fix it, but it still happens on a
3.16.0-25-generic kernel.

I should point out this doesn't happen instantly after a reboot, but at
some point it usually does. I don't know exactly how to reproduce the
bug, though, and the only solution I've found is rebooting.

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https://bugs.launchpad.net/bugs/1318802

Title:
  046d:c52b [Acer 5749] Logitech K400 Keyboard lags

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  Unfortunately on the 3.13 kernel the USB wireless keyboard Logitech
  K400 is not working fine.

  The mouse (touchpad) movement takes long time to accomplish: short
  move by finger leads to ten times longer pointer movements.

  Typing works fine only when typing slow, with pauses between keypresses. Otherwise keys get repeated:
  Ubuntutut
  Opeenenn
  Sourcee 

  The kernel downgrade "solves" the problem. Kernel 3.4 goldfish with 14.04 brings K400 back alive. 
  It works fine with kernel version 3.4, it works also fine and out of the box with 12.04 Ubuntu.

  I am ready to provide more info, if you explain me, how.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.47
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  zaur       4372 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Mon May 12 22:07:55 2014
  HibernationDevice: RESUME=UUID=e5364a02-e506-4a4b-ae01-a2bdaa69b3f1
  MachineType: Acer Aspire 5749
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=49c803ce-0cf2-4092-a522-cd8a5a0c151d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/28/2011
  dmi.bios.vendor: INSYDE
  dmi.bios.version: V1.05
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: HMA51_HR
  dmi.board.vendor: Acer
  dmi.board.version: Base Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnINSYDE:bvrV1.05:bd07/28/2011:svnAcer:pnAspire5749:pvrV1.05:rvnAcer:rnHMA51_HR:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.name: Aspire 5749
  dmi.product.version: V1.05
  dmi.sys.vendor: Acer

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