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[Vipin <v.rathor@xxxxxxxxx>]

All,
I'm facing the same problem since yesterday. The trackpoint (I don't use touchpad) just freezes on my Thinkpad T420 running 12.04 and 3.2.0-57-generic-pae kernel.
After reading the entire thread, I also tried Gero's suggestion but it didn't work for me.
For the first time (when trackpoint froze yesterday) i got the similar errors in dmesg and syslog like:
Dec 17 13:51:55 vipin-thinkpad-t420 kernel: [13612.139398] psmouse serio1: TouchPad at isa0060/serio1/input0 lost sync at byte 1
But today, the trackpoint froze for 3-4 times and such errors are not seen in logs.
I also noticed that this happens when I'm typing and want to use trackpoint immediately after that.
Strangely, I'm using this laptop (with same OS) since last 1+ year, this problem started to happen since yesterday only. And now it is happening everytime in only 5-10 mins after reboot.
Just wanted to give an update on my problem, so anyone working on this problem currently?

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https://bugs.launchpad.net/bugs/896922

Title:
  Lenovo L520 - "psmouse.c: touchpad at isa0060/serio4/input0 lost sync"
  and stops working for seconds

Status in The Linux Kernel:
  New
Status in xf86-input-synaptics:
  New
Status in “linux” package in Ubuntu:
  Incomplete
Status in “xserver-xorg-input-synaptics” package in Ubuntu:
  Confirmed

Bug description:
  Since Maverick, when using the touchpad, it's often not working and stucks for seconds, in short, it is unusesable. This bug still happens in Ubuntu 11.10 on a Lenovo L520 with 3.0.0-13-generic. Its a Synaptics touchpad, maybe it's kernel bug. Dmesg produces the following output:
  [14861.416567] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  [14861.417899] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  [14861.419232] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  [14861.420563] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  [14861.424233] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  [14861.424240] psmouse.c: issuing reconnect request
  [17240.238861] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 4
  [17240.240191] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  [17240.258248] psmouse.c: TouchPad at isa0060/serio4/input0 - driver resynched.
  [17695.950963] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  [17695.955414] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  [17695.956743] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  [17695.960402] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  [17695.961736] psmouse.c: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  [17695.961740] psmouse.c: issuing reconnect request

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-13-generic 3.0.0-13.22
  ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
  Uname: Linux 3.0.0-13-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mathias   15841 F.... pulseaudio
  CRDA: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf0900000 irq 43'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10ec0269,17aa21de,00100100 HDA:80862805,80860101,00100000'
     Controls      : 24
     Simple ctrls  : 11
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 8GHT26WW-1.080000'
     Mixer name	: 'ThinkPad EC 8GHT26WW-1.080000'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Sun Nov 27 17:58:09 2011
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: LENOVO 785954G
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-13-generic root=UUID=cf5078bd-6bdb-4d1b-a1bb-92d20c5ac60d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-13-generic N/A
   linux-backports-modules-3.0.0-13-generic  N/A
   linux-firmware                            1.60
  SourcePackage: linux
  StagingDrivers: rts_pstor mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/06/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8GET37WW (1.14 )
  dmi.board.name: 785954G
  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:bvr8GET37WW(1.14):bd10/06/2011:svnLENOVO:pn785954G:pvrThinkPadL520:rvnLENOVO:rn785954G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 785954G
  dmi.product.version: ThinkPad L520
  dmi.sys.vendor: LENOVO

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