I'm getting the same problem in 15.10 on a Lenovo Thinkpad Yoga S1.
Strange thing is it sometimes works fine for ages, then other times it
drops out every few seconds; enough to make it unusable.

syslog shows the following during a dropout:

Mar  1 16:07:54 vikyoga kernel: [26685.609961] psmouse serio1: TouchPad at 
isa0060/serio1/input0 lost synchronization, throwing 3 bytes away.
Mar  1 16:07:54 vikyoga kernel: [26686.120271] psmouse serio1: resync failed, 
issuing reconnect request
Mar  1 16:07:55 vikyoga kernel: [26686.967293] psmouse serio1: synaptics: 
queried max coordinates: x [..5708], y [..4698]
Mar  1 16:07:55 vikyoga kernel: [26687.012599] psmouse serio1: synaptics: 
queried min coordinates: x [1232..], y [1156..]
Mar  1 16:07:55 vikyoga kernel: [26687.012605] psmouse serio1: synaptics: 
quirked min/max coordinates: x [1232..5710], y [1156..4696]
Mar  1 16:08:09 vikyoga kernel: [26700.751279] psmouse serio1: TouchPad at 
isa0060/serio1/input0 lost synchronization, throwing 3 bytes away.
Mar  1 16:08:09 vikyoga kernel: [26701.264229] psmouse serio1: resync failed, 
issuing reconnect request
Mar  1 16:08:10 vikyoga kernel: [26701.947059] psmouse serio1: synaptics: 
Unable to query device.
Mar  1 16:08:10 vikyoga kernel: [26702.077439] psmouse serio1: Failed to 
deactivate mouse on isa0060/serio1
Mar  1 16:08:10 vikyoga kernel: [26702.241110] psmouse serio1: Failed to enable 
mouse on isa0060/serio1
Mar  1 16:08:14 vikyoga kernel: [26706.283941] psmouse serio1: synaptics: 
queried max coordinates: x [..5708], y [..4698]
Mar  1 16:08:15 vikyoga kernel: [26706.329401] psmouse serio1: synaptics: 
queried min coordinates: x [1232..], y [1156..]
Mar  1 16:08:15 vikyoga kernel: [26706.329406] psmouse serio1: synaptics: 
quirked min/max coordinates: x [1232..5710], y [1156..4696]
Mar  1 16:08:15 vikyoga kernel: [26706.413421] psmouse serio1: synaptics: 
Touchpad model: 1, fw: 8.1, id: 0x1e2b1, caps: 0xd002a3/0x940300/0x12f800/0x0, 
board id: 2911, fw id: 2560
Mar  1 16:08:15 vikyoga kernel: [26706.413429] psmouse serio1: synaptics: 
serio: Synaptics pass-through port at isa0060/serio1/input0
Mar  1 16:08:15 vikyoga kernel: [26706.466911] input: SynPS/2 Synaptics 
TouchPad as /devices/platform/i8042/serio1/input/input72
Mar  1 16:08:21 vikyoga kernel: [26712.360511] psmouse serio7: trackpoint: IBM 
TrackPoint firmware: 0x0e, buttons: 3/3
Mar  1 16:08:21 vikyoga kernel: [26712.641868] input: TPPS/2 IBM TrackPoint as 
/devices/platform/i8042/serio1/serio7/input/input73
Mar  1 16:08:13 vikyoga com.canonical.Unity.Scope.Home[16215]: message repeated 
10 times: [ (unity-scope-home:23786): unity-scope-home-WARNING **: 
scope.vala:235: Failed to get list of remote scopes: Request failed with error 
2]
Mar  1 16:08:23 vikyoga com.canonical.Unity.Scope.File.Gdrive[16215]: Search 
changed to: ''

-- 
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

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