I’m running an up-to-date tumbleweed. For some reason coasting no longer works on my alps touchpad in KDE plasma. The other touchpad functions work–tap to click, three-finger tapping etc. Coasting works fine in gnome. Not sure why it stopped working in plasma. I also noticed that in kde’s system settings, under input devices, there used to be a box where you could test the touchpad functions–clicking, scrolling, etc. That box is no longer there.