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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1165089/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
