Hello, This is the description of a bug that was probably introduced with kernel 4.11 (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d5dee39b27201f9f5460eca55efcc91a663b738c) I could successfully reproduce a behaviour of a "jumping pointer" in kernel 4.11 on 3 different devices with this touchpad, but not in kernel 4.10. A second issue, missing capabilities of the touchpad (probably not advertised correctly), is consistent up to the latest kernel. The pointer jumps occur regularly when moving; it seems to leap forward quite some pixels in the direction of movement. The distance of the jump seems to be dependend on the movement speed of the pointer; the faster I move it, the further the jump. This can occur in all directions. The mentioned second issue has a workaround due to some unrelated option that forces libinput to enable options for the touchpad that were not advertised. The touchpad is a 1-button clickpad that supports gestures. The issue is the missing "clickfinger" option (the name in libinput): 2-finger-tap works, 2-finger-click does not, although it should. Option buttonareas is available, but there is no middle or right button area. The jumping pointer issue makes the touchpad almost unusable. I am more than happy to provide any more input or help. Thanks for the good work!
Excuse the spam, although mentioned in the thread title, the touchpad in question is the Synaptics TM3242-001