Comment 27 for bug 619403

Adam: I'm really hesitant to put it into libinput because I'm not sure the problem scope is well understood (at least by me) and what the actual point of it is. So far it's been a "would be nice" but - at least these days :) - we require a bit more information about use-cases and precise behaviours.

libinput provides two values for wheels: physical degrees and concrete steps, so for most events on most mice you get a (15°, 1 step) tuple. There is no room for acceleration there, if anything the acceleration would have to be in the xf86-input-libinput driver. There we recently added a patch to adjust the scroll distance based on the angle (see Bug 92772) so a wheel can now produce smooth scrolling for XI2 clients.

But as for any actual acceleration, someone (you? :) would have to come up with a good plan of what the actual use-case is to solve and how to solve it. Not necessarily with code at first but at least to get a good idea of what's happening. And of course we'll need buy-in from the bigger desktop environments.