Twitchy scroll
Sometimes 2-finger scroll starts making jumps up and down. It's hard to reproduce on purpose, but I managed to do that this time. The record is done by placing two fingers, and vertically rolling a bit the left one. First ≈5 seconds it scrolls more-or-less as usual, but then it starts making abrupt jumps.
It's possible that this issue is related.
laptop: SAMSUNG NP305V5GA
$ udevadm info /dev/input/event7
P: /devices/platform/i8042/serio1/input/input7/event7
N: input/event7
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/event7
E: DEVPATH=/devices/platform/i8042/serio1/input/input7/event7
E: ID_BUS=i8042
E: ID_INPUT=1
E: ID_INPUT_HEIGHT_MM=48
E: ID_INPUT_TOUCHPAD=1
E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
E: ID_INPUT_WIDTH_MM=94
E: ID_PATH=platform-i8042-serio-1
E: ID_PATH_TAG=platform-i8042-serio-1
E: ID_SERIAL=noserial
E: LIBINPUT_DEVICE_GROUP=11/2/7:isa0060/serio1
E: LIBINPUT_FUZZ_00=8
E: LIBINPUT_FUZZ_01=8
E: LIBINPUT_FUZZ_35=8
E: LIBINPUT_FUZZ_36=8
E: LIBINPUT_MODEL_JUMPING_SEMI_MT=1
E: LIBINPUT_MODEL_SYNAPTICS_SERIAL_TOUCHPAD=1
E: MAJOR=13
E: MINOR=71
E: SUBSYSTEM=input
E: USEC_INITIALIZED=36139156
$ cat /sys/class/dmi/id/modalias
dmi:bvnAmericanMegatrendsInc.:bvr07PW.ME06.20120112.SKK:bd01/12/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn305V4A/305V5A/3415VA:pvr07PW:rvnSAMSUNGELECTRONICSCO.,LTD.:rn305V4A/305V4A:rvr07PW:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A: