Bug#869785: libinput10: Can't set base velocity and acceleration to match Logitech Trackball M570

[Alf <alf.debianfan@gmx.de>]

Am 16.07.2018 um 16:26 schrieb Hector Oron:

>
> Could you please test version 1.11.2-1 and report back?
>
> Best regards
>
No change so far, tested with libinput10 1.11.2-1 in Buster.

Please tell me a way how I can set base speed and accelleration profile 
for a Trackball. Mice work fine with default settings - but a TRACKBALL 
needs different settings as explained above for Velocity and Acceleration:
> Base Speed ist too high, acceleration is too high. It does not consider
> that with just a thumb you cannot position as exactly as with a mouse.
> Movements over greater distance just needs a small kick to let the ball
> spin, which does not apply to mice.

I had to revert to evdev again and current settings are:

$ xinput --list-props 10

Device 'Logitech M570':
	Device Enabled (136):	1
	Coordinate Transformation Matrix (138):	1.000000, 0.000000, 0.000000, 
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
	Device Accel Profile (264):	0
	Device Accel Constant Deceleration (265):	1.000000
	Device Accel Adaptive Deceleration (266):	1.000000
	Device Accel Velocity Scaling (267):	10.000000
	Device Product ID (259):	1133, 4136
	Device Node (260):	"/dev/input/event2"
	Evdev Axis Inversion (268):	0, 0
	Evdev Axes Swap (270):	0
	Axis Labels (271):	"Rel X" (146), "Rel Y" (147), "Rel Horiz Wheel" 
(292), "Rel Vert Wheel" (263)
	Button Labels (272):	"Button Left" (139), "Button Middle" (140), 
"Button Right" (141), "Button Wheel Up" (142), "Button Wheel Down" 
(143), "Button Horiz Wheel Left" (144), "Button Horiz Wheel Right" 
(145), "Button Side" (287), "Button Extra" (288), "Button Forward" 
(289), "Button Back" (290), "Button Task" (291), "Button Unknown" (262), 
"Button Unknown" (262), "Button Unknown" (262), "Button Unknown" (262), 
"Button Unknown" (262), "Button Unknown" (262), "Button Unknown" (262), 
"Button Unknown" (262), "Button Unknown" (262), "Button Unknown" (262), 
"Button Unknown" (262), "Button Unknown" (262)
	Evdev Scrolling Distance (273):	1, 1, 1
	Evdev Middle Button Emulation (274):	0
	Evdev Middle Button Timeout (275):	50
	Evdev Middle Button Button (276):	2
	Evdev Third Button Emulation (277):	0
	Evdev Third Button Emulation Timeout (278):	1000
	Evdev Third Button Emulation Button (279):	3
	Evdev Third Button Emulation Threshold (280):	20
	Evdev Wheel Emulation (281):	0
	Evdev Wheel Emulation Axes (282):	0, 0, 4, 5
	Evdev Wheel Emulation Inertia (283):	10
	Evdev Wheel Emulation Timeout (284):	200
	Evdev Wheel Emulation Button (285):	4
	Evdev Drag Lock Buttons (286):	0