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/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 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/896922/+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
