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 Ubuntu-X, which is subscribed to xserver-xorg-input-synaptics 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 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/896922/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
