Downstream Fedora bug: https://bugzilla.redhat.com/show_bug.cgi?id=1222214 Originally Fedora 23 (libinput-1.2.4-4.fc23.x86_64), but have tested in Fedora 25 beta and same issue persists. xinput list-props "ETPS/2 Elantech Touchpad" Device 'ETPS/2 Elantech Touchpad': Device Enabled (136): 1 Coordinate Transformation Matrix (138): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000 Device Accel Profile (263): 1 Device Accel Constant Deceleration (264): 2.500000 Device Accel Adaptive Deceleration (265): 1.000000 Device Accel Velocity Scaling (266): 12.500000 Synaptics Edges (267): 130, 3130, 123, 2159 Synaptics Finger (268): 1, 1, 0 Synaptics Tap Time (269): 180 Synaptics Tap Move (270): 175 Synaptics Tap Durations (271): 180, 100, 100 Synaptics ClickPad (272): 1 Synaptics Middle Button Timeout (273): 0 Synaptics Two-Finger Pressure (274): 282 Synaptics Two-Finger Width (275): 7 Synaptics Scrolling Distance (276): 79, 79 Synaptics Edge Scrolling (277): 0, 0, 0 Synaptics Two-Finger Scrolling (278): 1, 1 Synaptics Move Speed (279): 1.000000, 1.750000, 0.050264, 0.000000 Synaptics Off (280): 2 Synaptics Locked Drags (281): 0 Synaptics Locked Drags Timeout (282): 5000 Synaptics Tap Action (283): 0, 0, 0, 0, 1, 3, 2 Synaptics Click Action (284): 1, 3, 2 Synaptics Circular Scrolling (285): 0 Synaptics Circular Scrolling Distance (286): 0.100000 Synaptics Circular Scrolling Trigger (287): 0 Synaptics Circular Pad (288): 0 Synaptics Palm Detection (289): 0 Synaptics Palm Dimensions (290): 10, 200 Synaptics Coasting Speed (291): 20.000000, 50.000000 Synaptics Pressure Motion (292): 30, 160 Synaptics Pressure Motion Factor (293): 1.000000, 1.000000 Synaptics Grab Event Device (294): 0 Synaptics Gestures (295): 1 Synaptics Capabilities (296): 1, 0, 0, 1, 1, 1, 1 Synaptics Pad Resolution (297): 32, 32 Synaptics Area (298): 0, 0, 0, 0 Synaptics Soft Button Areas (299): 1630, 0, 1871, 0, 0, 0, 0, 0 Synaptics Noise Cancellation (300): 19, 19 Device Product ID (256): 2, 14 Device Node (257): "/dev/input/event4" udevadm info /sys/class/input/event4 P: /devices/platform/i8042/serio1/input/input5/event4 N: input/event4 S: input/by-path/platform-i8042-serio-1-event-mouse E: DEVLINKS=/dev/input/by-path/platform-i8042-serio-1-event-mouse E: DEVNAME=/dev/input/event4 E: DEVPATH=/devices/platform/i8042/serio1/input/input5/event4 E: ID_INPUT=1 E: ID_INPUT_HEIGHT_MM=71 E: ID_INPUT_TOUCHPAD=1 E: ID_INPUT_WIDTH_MM=101 E: ID_PATH=platform-i8042-serio-1 E: ID_PATH_TAG=platform-i8042-serio-1 E: ID_SERIAL=noserial E: LIBINPUT_ATTR_RESOLUTION_HINT=31x31 E: LIBINPUT_DEVICE_GROUP=11/2/e/0:isa0060/serio1 E: LIBINPUT_MODEL_ELANTECH_TOUCHPAD=1 E: MAJOR=13 E: MINOR=68 E: SUBSYSTEM=input E: USEC_INITIALIZED=6441988 Model: Samsung 700Z5A cat /sys/class/dmi/id/modalias dmi:bvnPhoenixTechnologiesLtd.:bvr15FD:bd11/06/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn700Z3A/700Z4A/700Z5A/700Z5B:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rn700Z3A/700Z4A/700Z5A/700Z5B:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1: Physical dimensions: 76mm x 107mm
About output was while running synaptics driver rather than libinput, can re-run with libinput if necessary.
See bug 98535, please try libinput master and report back whether this improves things. Thanks
Tried libinput-1.5.902-1.fc25.x86_64 and its definitely better, but still "jumpy"/nonlinear on the Y axis, so cursor often jumps over buttons etc.
libinput 1.11rc1 has slower-by-default touchpad pointer acceleration and this may make the pointer jumps less of an issue now. Please test that and let me know.
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