I think I observe a very similar issue on ubuntu 16.04, only in my case mouse reaction to touchpad is very laggy and jumpy/choppy. It started after one of the recent kernel updates. For me linux- image-4.4.0-72-generic seems to work fine with default kernel options, linux-image-4.4.0-78-generic is broken, so it must be one of the changes between these two version which breaks this.
Syslog: May 24 23:38:15 abbot kernel: [ 958.625194] psmouse serio1: Touchpad at isa0060/serio1/input0 lost synchronization, throwing 5 bytes away. May 24 23:38:15 abbot kernel: [ 959.139410] psmouse serio1: resync failed, issuing reconnect request May 24 23:38:16 abbot kernel: [ 959.676100] psmouse serio1: elantech: retrying ps2 command 0xf8 (2). May 24 23:38:16 abbot kernel: [ 960.186792] psmouse serio1: elantech: retrying ps2 command 0x00 (2). May 24 23:38:17 abbot kernel: [ 960.888154] psmouse serio1: elantech: retrying ps2 command 0x00 (1). May 24 23:38:18 abbot kernel: [ 961.592132] psmouse serio1: elantech: retrying ps2 command 0x00 (0). May 24 23:38:18 abbot kernel: [ 962.096170] psmouse serio1: elantech: ps2 command 0x00 failed. May 24 23:38:18 abbot kernel: [ 962.096181] psmouse serio1: elantech: failed to write register 0x07 with value 0x01. May 24 23:38:18 abbot kernel: [ 962.096183] psmouse serio1: elantech: failed to initialise registers. May 24 23:38:18 abbot kernel: [ 962.096184] psmouse serio1: elantech: failed to put touchpad back into absolute mode. May 24 23:38:19 abbot kernel: [ 962.803046] psmouse serio1: elantech: assuming hardware version 4 (with firmware version 0x4d1f03) May 24 23:38:19 abbot kernel: [ 962.818943] psmouse serio1: elantech: Synaptics capabilities query result 0x80, 0x14, 0x0c. May 24 23:38:19 abbot kernel: [ 962.832728] psmouse serio1: elantech: Elan sample query result 05, 00, 85 May 24 23:38:19 abbot kernel: [ 962.894729] input: Elantech PS/2 TrackPoint as /devices/platform/i8042/serio1/input/input18 May 24 23:38:19 abbot kernel: [ 962.911950] input: ETPS/2 Elantech Touchpad as /devices/platform/i8042/serio1/input/input17 May 24 23:38:37 abbot kernel: [ 980.879537] psmouse serio1: Touchpad at isa0060/serio1/input0 lost sync at byte 6 May 24 23:38:38 abbot kernel: [ 982.051838] psmouse serio1: Touchpad at isa0060/serio1/input0 lost synchronization, throwing 2 bytes away. May 24 23:38:39 abbot kernel: [ 982.563469] psmouse serio1: resync failed, issuing reconnect request -- 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 ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
