I had similar problem after upgrading from Ubuntu 14.04 to 18.04 (Ubuntu 4.15.0-42.45-generic 4.15.18). I noticied that when I shut down wifi the touchpad lag is gone. Also when I turn wifi on again, the lag doesn't re-appear. After restarting my laptop the lag is back again. Dmesg shows (after the turning wifi off and on again) an extra piece of information (although I don't know what it means):
[ 802.187333] psmouse serio1: TouchPad at isa0060/serio1/input0 lost synchronization, throwing 5 bytes away. [ 818.784094] wlp6s0: deauthenticating from 0**** by local choice (Reason: 3=DEAUTH_LEAVING) [ 838.410647] IPv6: ADDRCONF(NETDEV_UP): wlp6s0: link is not ready [ 838.540339] IPv6: ADDRCONF(NETDEV_UP): wlp6s0: link is not ready [ 840.208690] wlp6s0: authenticate with 0***** [ 840.610491] wlp6s0: send auth to 0**** (try 1/3) [ 840.613821] wlp6s0: authenticated [ 840.618291] wlp6s0: associate with 0***** (try 1/3) [ 840.621835] wlp6s0: RX AssocResp from 0***** (capab=0x411 status=0 aid=9) [ 840.622520] wlp6s0: associated [ 840.645374] IPv6: ADDRCONF(NETDEV_CHANGE): wlp6s0: link becomes ready -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1679962 Title: psmouse serio1: Explorer Mouse at isa0060/serio1/input0 lost synchronization, throwing 3 bytes away. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1679962/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
