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[Gero Graubner <1165089@xxxxxxxxxxxxxxxxxx>]

I just discovered (using Thinkpad L520 with 12.04 LTS, Kernel
3.2.0-53-generic), that there must be something wrong with the CPU
frequency scaling.

Found this in the Arch-Linux Wiki:

'If you use CPU frequency scaling, avoid using the "ondemand" governor
and use the "performance" governor when possible, as the touchpad may
lose sync when the CPU frequency changes."

https://wiki.archlinux.org/index.php/Touchpad_Synaptics#Touchpad_synchronization_issues

If I set the governor to "performance" instead of "ondemand" the sync-
faults totaly gone.

If you run Unity you can try the indicator-cpufreq (sudo apt-get install
indicator-cpufreq)

Choose "performance" and test it. No stucks and sync-faults.
After going back to "ondemand" the stucks are back.

The gonvernor was always set to "performance" after boot/login, but was
switched to "ondemand" after a minute or so (to speed up login speed as
much as possible)

As a workaround until (hopefully) a fix is comming:
So, if you want to set the govenor fix to "performance" you have to edit the file: etc/init.d/ondemand (line 27) and change

echo -n ondemand > $CPUFREQ

to

echo -n performance > $CPUFREQ'

or simply paste:
sudo sed -i s/'echo -n ondemand > $CPUFREQ'/'echo -n performance > $CPUFREQ'/g /etc/init.d/ondemand

and reboot.

To switch it back to default "ondemand" paste:
sudo sed -i s/'echo -n performance > $CPUFREQ'/'echo -n ondemand > $CPUFREQ'/g /etc/init.d/ondemand

Gero

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1165089

Title:
  [Lenovo 3000 N100 Notebook 0768] Synaptic Touchpad constantly losing
  sync

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  A common problem has popped back up again in raring and quantal (but
  was ok in the precise I've just upgraded from).

  The Touchpad is regularly losing sync during operation, which causes
  jerky operation at best and at worst loses trackpad key function.

  Apr  5 17:40:47 lenovo-3000-n100 kernel: [ 1214.752049] psmouse serio4: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  Apr  5 17:40:47 lenovo-3000-n100 kernel: [ 1214.754952] psmouse serio4: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  Apr  5 17:40:47 lenovo-3000-n100 kernel: [ 1214.757223] psmouse serio4: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  Apr  5 17:40:47 lenovo-3000-n100 kernel: [ 1214.765448] psmouse serio4: TouchPad at isa0060/serio4/input0 lost sync at byte 4
  Apr  5 17:40:47 lenovo-3000-n100 kernel: [ 1214.767379] psmouse serio4: TouchPad at isa0060/serio4/input0 lost sync at byte 1
  Apr  5 17:40:47 lenovo-3000-n100 kernel: [ 1214.767387] psmouse serio4: issuing reconnect request

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-16-generic 3.8.0-16.26
  ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
  Uname: Linux 3.8.0-16-generic x86_64
  ApportVersion: 2.9.2-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  neil       2117 F.... pulseaudio
  CRDA:
   country GB:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (N/A, 20)
   	(5250 - 5330 @ 40), (N/A, 20), DFS
   	(5490 - 5710 @ 40), (N/A, 27), DFS
  CheckboxSubmission: 55cafa5b8b82ed224cc59d444cb1fc25
  CheckboxSystem: 3e53d3ea5811723345f19eff5070f9ab
  Date: Fri Apr  5 17:41:28 2013
  HibernationDevice: RESUME=UUID=eea5dc1e-6d43-4a78-a111-eb7538c00ed5
  InstallationDate: Installed on 2012-02-20 (409 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: LENOVO 0768BXG
  MarkForUpload: True
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-16-generic root=UUID=69e127cd-4d69-448f-a3bc-2a63defc51ae ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-16-generic N/A
   linux-backports-modules-3.8.0-16-generic  N/A
   linux-firmware                            1.104
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-04-05 (0 days ago)
  dmi.bios.date: 04/30/07
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 63ET62WW
  dmi.board.name: CAPELL VALLEY(NAPA) CRB
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Applicable
  dmi.chassis.type: 10
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnLENOVO:bvr63ET62WW:bd04/30/07:svnLENOVO:pn0768BXG:pvr3000N100:rvnLENOVO:rnCAPELLVALLEY(NAPA)CRB:rvrNotApplicable:cvnNoEnclosure:ct10:cvrN/A:
  dmi.product.name: 0768BXG
  dmi.product.version: 3000 N100
  dmi.sys.vendor: LENOVO

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