I'm back on Linux and I tried everything I remember to be possible: the Arch Linux wiki page on this (xorg part), changing it on KDE's mouse properties, installing evdev and libinput and whatnot. Nothing. Mouse acceleration still happens.
Any suggestions?
Debian Stretch x64
Logitech MX310
EDIT: Didn't think it would work, but it did: http://www.webupd8.org/2016/08/how-to-c ... mouse.html