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[Mira <mdiskuze@xxxxxxxxx>]

I have same problem with my M510 mouse and K340 keyboard. After 12.04
64bit upgrade to 13.10 64bit - mouse and kbd was very very laggy.
Solution for me was:

sudo sh -c 'echo "options drm_kms_helper poll=0" >> /etc/modprobe.d/local.conf'
sudo update-initramfs -u

for
3.11.0-15-generic x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/1248100

Title:
  046d:c52b [ThinkPad L520] Logitech Unified Receiver very laggy

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Since upgrading to 13.10, my wireless Logitech keyboard and mouse have
  been very laggy and quite unusable. The mouse barely moves or responds
  most of the time, and the keyboard either ignores input or gets stuck
  on a character, or sequence of characters, and repeats them
  constantly. They were both working in 13.04.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19 [modified: boot/vmlinuz-3.11.0-12-generic]
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  valorin    2420 F.... pulseaudio
  Date: Tue Nov  5 21:05:09 2013
  HibernationDevice: RESUME=UUID=20653816-c79a-43a2-bd96-aab0af013acf
  InstallationDate: Installed on 2013-10-29 (7 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: LENOVO 7859CTO
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=416f70c3-ac4e-4e00-a8aa-56a37d187587 ro quiet splash noapic vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/04/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8GET38WW (1.15 )
  dmi.board.name: 7859CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8GET38WW(1.15):bd11/04/2011:svnLENOVO:pn7859CTO:pvrThinkPadL520:rvnLENOVO:rn7859CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 7859CTO
  dmi.product.version: ThinkPad L520
  dmi.sys.vendor: LENOVO

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