Wrong touch event coordinates in some situations on Linux machines

Versions

• Python: 3.7.3
• OS: Raspbian (RPI 4)
• Kivy: 1.11.1

Description

Sometimes when I try to move one slider another simultaneously moves as the original. I’ve tried to reproduce this bug on OS X, Windows 10, Raspbian and Arch Linux. On OS X and Windows 10, I haven’t succeeded to reproduce it. I have also tried to use the joystick component url and I’ve got the same behavior. I’ve tried to print coordinates in on_touch_down method and there are really two pairs of coordinates.

Code and Logs

Part of the code, all sliders are built the same way

GridLayout:
                cols:3
                rows:6
                id: parent_joint
                padding: dp(10)
                BoxLayout:
                    size_hint_x: None
                    width: parent_joint.width * 0.77
                    Slider:
                        orientation: 'horizontal'
                        value: 0
                        min: -185
                        max: 185
                        step: 1
                        value_track:True
                        sensitivity: 'handle'
                Label:
                    size_hint_x: None
                    width: parent_joint.width * 0.12
                    id: baseValue
                    markup: True
               

[tshirtman]

Just so you know, this other line was used to auto detect multitouch devices, if you only care about single touch, you can keep using the mouse, if you want multi, you’ll want to disable the mouse and instead make sure the probesysfs is properly configured and calibrated.

[tshirtman]

can you try to comment out the last line?