I confirm this too, though I'm gentoo user. Hope this info will be of some use:
Samsung 900X4c, kernel 3.11.6, xf86-input-evdev-2.8.2, 
xf86-input-synaptics-1.7.1
Behaviour: Internal keyboard and touchpad freeze after random period of use, 
external (usb) keyboard and mouse work fine. I suppose problem lays deeper than 
evdev (touchpad uses synaptics). I'm not sure, but it looks like internal kbd 
and touchpad use ps/2 interface.

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https://bugs.launchpad.net/bugs/877010

Title:
  Keyboard freezes at random

Status in “xserver-xorg-input-evdev” package in Ubuntu:
  Confirmed

Bug description:
  My keyboard freezes at random or gets stuck on repeated input. I
  started with a clean install of 11.04, had the problem form the
  beginning and it persisted when I upgraded to 11.10. I use a desktop
  PC and my keyboard is a plain PS2 type. My mouse that is USB never
  freezes.

  I made a script on my desktop so I can run it to collect some log
  files when the problem occurred. Sure enough, I caught some errors but
  I have no idea how to fix this. I'm not really an advanced linux user,
  so I attach these logs in the hope that some of you might help me out.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: compiz 1:0.9.6+bzr20110929-0ubuntu3
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  NonfreeKernelModules: fglrx
  .tmp.unity.support.test.0:
   
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,place,snap,mousepoll,compiztoolbox,session,imgpng,resize,vpswitch,gnomecompat,regex,move,grid,wall,unitymtgrabhandles,animation,fade,workarounds,expo,ezoom,scale,unityshell]
  CompositorRunning: compiz
  Date: Tue Oct 18 03:03:35 2011
  DistUpgraded: Log time: 2011-10-15 21:09:03.675604
  DistroCodename: oneiric
  DistroVariant: ubuntu
  DkmsStatus:
   fglrx, 8.881, 2.6.38-11-generic, x86_64: installed
   fglrx, 8.881, 3.0.0-12-generic, x86_64: installed
  GraphicsCard:
   ATI Technologies Inc Radeon HD 5800 Series (Cypress LE) [1002:689e] (prog-if 
00 [VGA controller])
     Subsystem: PC Partner Limited Device [174b:e140]
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  JockeyStatus:
   xorg:fglrx_updates - ATI/AMD proprietary FGLRX graphics driver (post-release 
updates) (Proprietary, Disabled, Not in use)
   xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietary, 
Enabled, In use)
  MachineType: System manufacturer System Product Name
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic 
root=UUID=229978bd-384c-43ef-85b1-c23e3c846704 ro quiet splash vt.handoff=7
  SourcePackage: compiz
  UpgradeStatus: Upgraded to oneiric on 2011-10-15 (2 days ago)
  dmi.bios.date: 12/07/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1207
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P7P55D
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1207:bd12/07/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP7P55D:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu3
  version.fglrx-installer: fglrx-installer N/A
  version.ia32-libs: ia32-libs 20090808ubuntu26
  version.libdrm2: libdrm2 2.4.26-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
  version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20110811.g93fc084-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110411+8378443-1

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