rm /usr/share/X11/xorg.conf.d/40-libinput.conf and everything
works again. Also probably don't read the rest of this because it sucks.
Some idiots have rewritten the X input layer and called it "libinput".
Unsurprisingly this breaks all of your existing configs and tools (xset and the old synaptics configs don't work) with no benefit.
But it gets better: you can no longer change your mouse sensitivity.
You're supposed to be able to install a separate program, xinput, which prints out this:
Virtual core pointer id=2 [master pointer (3)] - Virtual core XTEST pointer id=4 [slave pointer (2)] - Laview Technology Xornet II id=9 [slave pointer (2)] - Laview Technology Xornet II id=10 [slave pointer (2)] - Wacom Intuos PT S Pen stylus id=11 [slave pointer (2)] - Wacom Intuos PT S Finger touch id=12 [slave pointer (2)] - Wacom Intuos PT S Pad pad id=13 [slave pointer (2)] - Wacom Intuos PT S Pen eraser id=18 [slave pointer (2)] Virtual core keyboard id=3 [master keyboard (2)] - Virtual core XTEST keyboard id=5 [slave keyboard (3)] - Power Button id=6 [slave keyboard (3)] - Power Button id=7 [slave keyboard (3)] - Sleep Button id=8 [slave keyboard (3)] - USB Keyboard id=14 [slave keyboard (3)] - USB Keyboard id=15 [slave keyboard (3)] - Eee PC WMI hotkeys id=16 [slave keyboard (3)] - Laview Technology Xornet II id=17 [slave keyboard (3)]
and then you're supposed to run
xinput --list-props XX where XX is all
the ids, and it prints a huge pile of shit:
Device 'Laview Technology Xornet II': Device Enabled (152): 1 Coordinate Transformation Matrix (154): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000 libinput Accel Speed (286): 0.000000 libinput Accel Speed Default (287): 0.000000 libinput Accel Profiles Available (288): 1, 1 libinput Accel Profile Enabled (289): 1, 0 libinput Accel Profile Enabled Default (290): 1, 0 libinput Natural Scrolling Enabled (291): 0 libinput Natural Scrolling Enabled Default (292): 0 libinput Send Events Modes Available (271): 1, 0 libinput Send Events Mode Enabled (272): 0, 0 libinput Send Events Mode Enabled Default (273): 0, 0 libinput Left Handed Enabled (293): 0 libinput Left Handed Enabled Default (294): 0 libinput Scroll Methods Available (295): 0, 0, 1 libinput Scroll Method Enabled (296): 0, 0, 0 libinput Scroll Method Enabled Default (297): 0, 0, 0 libinput Button Scrolling Button (298): 2 libinput Button Scrolling Button Default (299): 2 libinput Middle Emulation Enabled (300): 0 libinput Middle Emulation Enabled Default (301): 0 Device Node (274): "/dev/input/event23" Device Product ID (275): 9494, 43 libinput Drag Lock Buttons (302): <no items> libinput Horizontal Scroll Enabled (303): 1
Note that none of those are mouse sensitivity. Google says it's supposed
to be called
Device Accel Constant Deceleration (wtf), but that's not
I'm especially annoyed with the distro maintainers for this. When there's a breaking change coming, it's everyone's responsibility to push back against it. When you have tens of thousands of users, even small breaking changes add up to multiple man years of effort. You have to ask, "is this update worth millions of dollars of people's time?"
When the answer is no, as a developer you scrap it and do something better. As a middle man (distro maintainers etc) you tell them to go away and do better. As a user, wave goodbye to many hours of your time because nobody cares about the cost/benefit.