Red Hat Bugzilla – Bug 1262637
Mouse cursor jumps
Last modified: 2015-10-13 14:22:58 EDT
Description of problem:
sometimes the cursor will jump when moving finger on the trackpad slowly.
Version-Release number of selected component (if applicable):
FC22 4.1.6-201.fc22.x86_64, libinput 0.21.0 (3.fc22)
Often - occurs 50-75% of the time
Steps to Reproduce:
1. move finger slowly on trackpad
cursor will typically jump the space of 2-3 characters making highlighting text on terminal (Konsole) to copy&paste difficult to use with trackpad.
cursor should not jump.
libinput-debug-events (note the -14.95 and -11.64 numbers in 4th column - this is when the mouse cursor jumps)
...event7 POINTER_MOTION +35.62s 0.14/ 0.00
event7 POINTER_MOTION +35.63s 0.26/ 0.00
event7 POINTER_MOTION +35.68s 0.12/ 0.00
event7 POINTER_MOTION +36.80s -2.80/ 0.00
event7 POINTER_MOTION +36.81s -14.95/ 0.00
event7 POINTER_MOTION +36.82s -11.64/ 0.00
event7 POINTER_MOTION +36.83s -0.91/ 0.00
event7 POINTER_MOTION +36.84s -0.70/ 0.00
event7 POINTER_MOTION +36.86s -0.70/ 0.00
event7 POINTER_MOTION +36.89s -0.52/ 0.00
event7 POINTER_MOTION +36.99s -0.17/ 0.00
event7 POINTER_MOTION +37.00s -0.35/ 0.00
event7 POINTER_MOTION +37.02s -0.70/ 0.00...
dmesg | grep synaptics:
[ 2.090568] psmouse serio1: synaptics: Touchpad model: 1, fw: 8.1, id: 0x1e2b1, caps: 0xf004a3/0x943300/0x12e800, board id: 3053, fw id: 2560
[ 2.090574] psmouse serio1: synaptics: serio: Synaptics pass-through port at isa0060/serio1/input0
please record this with evemu-record, then attach the otutput here. thanks
Created attachment 1082547 [details]
evemu-record.log file: line 413 shows Y of 2856. line 444 shows Y of 2818 - a difference of 38 which feels like the amount of pixels the cursor jumps when the problem exists.
Created attachment 1082548 [details]
further to my previous testing, this jumping is also occuring in windows OS, so it appears not to be a linux/input specific problem.
i've seen the odd report of this around online (https://bbs.archlinux.org/viewtopic.php?id=201173) so could be a faulty batch/firmware issue with the trackpad.
I'll mark this as closed as i doubt anything can be done in the driver at the moment in time..