Created attachment 134345 [details] evemu-record reproducing the bug I have an Acer Aspire V5-573PG with Synaptics touchpad, running Debian testing distribution. The libinput version installed is 1.8.2-1. When moving the pointer with the touchpad, when trying to make precise and slow movements, the cursor makes jumps instead of moving precisely between continuous pixels. This behaviour is not the one expected, as with the Synaptics driver the precision in this type of movement is perfect, as it is in Windows too. Evemu-record file reproducing the bug attached. The udevadm info returns: P: /devices/platform/i8042/serio1/input/input2/event1 N: input/event1 E: DEVNAME=/dev/input/event1 E: DEVPATH=/devices/platform/i8042/serio1/input/input2/event1 E: ID_BUS=i8042 E: ID_INPUT=1 E: ID_INPUT_HEIGHT_MM=75 E: ID_INPUT_TOUCHPAD=1 E: ID_INPUT_TOUCHPAD_INTEGRATION=internal E: ID_INPUT_WIDTH_MM=104 E: LIBINPUT_ATTR_PRESSURE_RANGE=10:8 E: LIBINPUT_DEVICE_GROUP=11/2/7/1b1:isa0060/serio1 E: LIBINPUT_MODEL_SYNAPTICS_SERIAL_TOUCHPAD=1 E: MAJOR=13 E: MINOR=65 E: SUBSYSTEM=input E: USEC_INITIALIZED=12970407 The contents of /sys/class/dmi/id/modalias is: dmi:bvnInsydeCorp.:bvrV2.30:bd01/12/2015:svnAcer:pnAspireV5-573PG:pvrTBDbyOEM:rvnAcer:rnDazzle_HW:rvrType2-A01BoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion: The evemu-describre command returns: # EVEMU 1.3 # Kernel: 4.12.0-1-amd64 # DMI: dmi:bvnInsydeCorp.:bvrV2.30:bd01/12/2015:svnAcer:pnAspireV5-573PG:pvrTBDbyOEM:rvnAcer:rnDazzle_HW:rvrType2-A01BoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion: # Input device name: "SynPS/2 Synaptics TouchPad" # Input device ID: bus 0x11 vendor 0x02 product 0x07 version 0x1b1 # Size in mm: 104x75 # Supported events: # Event type 0 (EV_SYN) # Event code 0 (SYN_REPORT) # Event code 1 (SYN_CONFIG) # Event code 2 (SYN_MT_REPORT) # Event code 3 (SYN_DROPPED) # Event code 4 ((null)) # Event code 5 ((null)) # Event code 6 ((null)) # Event code 7 ((null)) # Event code 8 ((null)) # Event code 9 ((null)) # Event code 10 ((null)) # Event code 11 ((null)) # Event code 12 ((null)) # Event code 13 ((null)) # Event code 14 ((null)) # Event code 15 (SYN_MAX) # Event type 1 (EV_KEY) # Event code 272 (BTN_LEFT) # Event code 325 (BTN_TOOL_FINGER) # Event code 328 (BTN_TOOL_QUINTTAP) # Event code 330 (BTN_TOUCH) # Event code 333 (BTN_TOOL_DOUBLETAP) # Event code 334 (BTN_TOOL_TRIPLETAP) # Event code 335 (BTN_TOOL_QUADTAP) # Event type 3 (EV_ABS) # Event code 0 (ABS_X) # Value 4681 # Min 1278 # Max 5662 # Fuzz 0 # Flat 0 # Resolution 42 # Event code 1 (ABS_Y) # Value 2031 # Min 1198 # Max 4656 # Fuzz 0 # Flat 0 # Resolution 46 # Event code 24 (ABS_PRESSURE) # Value 0 # Min 0 # Max 255 # Fuzz 0 # Flat 0 # Resolution 0 # Event code 28 (ABS_TOOL_WIDTH) # Value 0 # Min 0 # Max 15 # Fuzz 0 # Flat 0 # Resolution 0 # Event code 47 (ABS_MT_SLOT) # Value 1 # Min 0 # Max 1 # Fuzz 0 # Flat 0 # Resolution 0 # Event code 53 (ABS_MT_POSITION_X) # Value 0 # Min 1278 # Max 5662 # Fuzz 8 # Flat 0 # Resolution 42 # Event code 54 (ABS_MT_POSITION_Y) # Value 0 # Min 1198 # Max 4656 # Fuzz 8 # Flat 0 # Resolution 46 # Event code 57 (ABS_MT_TRACKING_ID) # Value 0 # Min 0 # Max 65535 # Fuzz 0 # Flat 0 # Resolution 0 # Event code 58 (ABS_MT_PRESSURE) # Value 0 # Min 0 # Max 255 # Fuzz 0 # Flat 0 # Resolution 0 # Properties: # Property type 0 (INPUT_PROP_POINTER) # Property type 2 (INPUT_PROP_BUTTONPAD) N: SynPS/2 Synaptics TouchPad I: 0011 0002 0007 01b1 P: 05 00 00 00 00 00 00 00 B: 00 0b 00 00 00 00 00 00 00 B: 01 00 00 00 00 00 00 00 00 B: 01 00 00 00 00 00 00 00 00 B: 01 00 00 00 00 00 00 00 00 B: 01 00 00 00 00 00 00 00 00 B: 01 00 00 01 00 00 00 00 00 B: 01 20 e5 00 00 00 00 00 00 B: 01 00 00 00 00 00 00 00 00 B: 01 00 00 00 00 00 00 00 00 B: 01 00 00 00 00 00 00 00 00 B: 01 00 00 00 00 00 00 00 00 B: 01 00 00 00 00 00 00 00 00 B: 01 00 00 00 00 00 00 00 00 B: 02 00 00 00 00 00 00 00 00 B: 03 03 00 00 11 00 80 60 06 B: 04 00 00 00 00 00 00 00 00 B: 05 00 00 00 00 00 00 00 00 B: 11 00 00 00 00 00 00 00 00 B: 12 00 00 00 00 00 00 00 00 B: 14 00 00 00 00 00 00 00 00 B: 15 00 00 00 00 00 00 00 00 B: 15 00 00 00 00 00 00 00 00 A: 00 1278 5662 0 0 42 A: 01 1198 4656 0 0 46 A: 18 0 255 0 0 0 A: 1c 0 15 0 0 0 A: 2f 0 1 0 0 0 A: 35 1278 5662 8 0 42 A: 36 1198 4656 8 0 46 A: 39 0 65535 0 0 0 A: 3a 0 255 0 0 0
This is almost certainly hysteresis: https://bugs.freedesktop.org/show_bug.cgi?id=98839 *** This bug has been marked as a duplicate of bug 98839 ***
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