With the update to Plasma 6.8, I was forced to switch to Wayland. This has completely messed up the behaviour of my touchpad.
Previously I had been using xf86-input-synaptics. I know that this has been deprecated for a while, but each time I tried to switch to libinput, the touchpad behaviour changed so much that I couldn’t get used to it even after a few days.
I believe I was using the default settings of the synaptics driver. This is the output of synclient -l:
Parameter settings:
LeftEdge = 141
RightEdge = 3387
TopEdge = 96
BottomEdge = 1697
FingerLow = 25
FingerHigh = 30
MaxTapTime = 180
MaxTapMove = 174
MaxDoubleTapTime = 180
SingleTapTimeout = 180
ClickTime = 100
EmulateMidButtonTime = 0
EmulateTwoFingerMinZ = 282
EmulateTwoFingerMinW = 7
VertScrollDelta = 79
HorizScrollDelta = 79
VertEdgeScroll = 1
HorizEdgeScroll = 1
CornerCoasting = 0
VertTwoFingerScroll = 1
HorizTwoFingerScroll = 1
MinSpeed = 1
MaxSpeed = 1.75
AccelFactor = 0.0505433
TouchpadOff = 0
LockedDrags = 0
LockedDragTimeout = 5000
RTCornerButton = 0
RBCornerButton = 0
LTCornerButton = 0
LBCornerButton = 0
TapButton1 = 1
TapButton2 = 2
TapButton3 = 3
ClickFinger1 = 1
ClickFinger2 = 3
ClickFinger3 = 2
CircularScrolling = 0
CircScrollDelta = 0.1
CircScrollTrigger = 0
CircularPad = 0
PalmDetect = 0
PalmMinWidth = 10
PalmMinZ = 200
CoastingSpeed = 20
CoastingFriction = 50
PressureMotionMinZ = 30
PressureMotionMaxZ = 160
PressureMotionMinFactor = 1
PressureMotionMaxFactor = 1
GrabEventDevice = 0
TapAndDragGesture = 1
AreaLeftEdge = 0
AreaRightEdge = 0
AreaTopEdge = 0
AreaBottomEdge = 0
HorizHysteresis = 19
VertHysteresis = 19
ClickPad = 1
RightButtonAreaLeft = 1764
RightButtonAreaRight = 0
RightButtonAreaTop = 1470
RightButtonAreaBottom = 0
MiddleButtonAreaLeft = 0
MiddleButtonAreaRight = 0
MiddleButtonAreaTop = 0
MiddleButtonAreaBottom = 0
This is the relevant output of libinput list-devices:
Device: ELAN0676:00 04F3:3195 Touchpad
Kernel: /dev/input/event6
Id: i2c:04f3:3195
Group: 2
Seat: seat0, default
Size: 114x58mm
Capabilities: pointer gesture
Tap-to-click: disabled
Tap-and-drag: enabled
Tap button map: left/right/middle
Tap drag lock: disabled
Left-handed: disabled
Nat.scrolling: disabled
Middle emulation: disabled
Calibration: n/a
Scroll methods: *two-finger edge
Scroll button: n/a
Scroll button lock: n/a
Click methods: *button-areas clickfinger
Clickfinger button map: left/right/middle
Disable-w-typing: enabled
Disable-w-trackpointing: enabled
Accel profiles: flat *adaptive custom
Rotation: n/a
Area rectangle: n/a
This is on a ThinkPad T14 Gen5 AMD running Arch Linux.
The concrete misbehaviour that I have observed:
- At slow touch movement, the mouse cursor moves too fast
- At medium touch movement, the mouse cursor moves too slow
- At fast touch movement, the mouse cursor moves too fast
- I cannot scroll by sliding along the right/bottom edge of the touchpad (I can only do 2-finger scroll. I need to be able to do both.)
- When I do 2-finger scroll, for the first few millimetres of touch movement, it does not scroll. Then it suddenly starts.
- When I scroll, and then stop touching the touchpad, the application keeps on scrolling for a long time. I need it to stop as soon as I leave the touchpad.
- If I try to use the touchpad after typing on the keyboard, it does not react for a short while.
What are the steps necessary to restore the old touchpad behaviour on Wayland using libinput?
