logid.cfg for Logitech MX Master 3 with music, brightness, volume and workspaces controls (using gestures) in KDE Plasma. Working thumbwheel.

logid.cfg

// Logiops (Linux driver) configuration for Logitech MX Master 3.
// Includes gestures, smartshift, DPI.
// Tested on logid v0.2.3 - GNOME 3.38.4 on Zorin OS 16 Pro
// What's working:
//   1. Window snapping using Gesture button (Thumb)
//   2. Forward Back Buttons
//   3. Top button (Ratchet-Free wheel)
// What's not working:

//   1. Scroll button

// File location: /etc/logid.cfg

devices: ({
  name: "Wireless Mouse MX Master 3";

  smartshift: {
    on: true;
    threshold: 14;
  };

  hiresscroll: {
    hires: true;
    invert: false;
    target: false;
  };

  dpi: 1350; // max=4000
  buttons: (
    //Forward btn 
    {
        cid: 0x56;
        action = {
            type: "Gestures";
            gestures: (
                {
                    direction: "None";
                    mode: "OnRelease";
                    action = {
                        type: "Keypress";
                        keys: [ "KEY_FORWARD" ];
                    }
                },
                {
                    interval: 5;
                    threshold: 3;
                    direction: "Up";
                    mode: "OnInterval";
                    action = {
                    type: "Keypress";
                    keys: [ "KEY_BRIGHTNESSUP" ];
                    }
                },
                {
                    interval: 5;
                    threshold: 3;
                    direction: "Down";
                    mode: "OnInterval";
                    action = {
                    type: "Keypress";
                    keys: [ "KEY_BRIGHTNESSDOWN" ];
                    }
                },
                /*  {
                    direction: "Right";
                    mode: "OnRelease";
                    action = {
                    type: "Keypress";
                    keys: [ "KEY_F2" ];
                    }
                },
                */
              //  {
              //      direction: "Left";
              //      mode: "OnRelease";
              //      action = {
              //      type: "Keypress";
              //      keys: [ "KEY_FASTBACKWARD" ];
              //      }
              //  }
            );
        };
    },
    //Back btn 
    {
        cid: 0x53;
        action = {
            type: "Gestures";
            gestures: (
                {
                    direction: "None";
                    mode: "OnRelease";
                    action = {
                        type: "Keypress";
                        keys: [ "KEY_BACK" ];
                    }
                },
                {
                    direction: "Up";
                    mode: "OnRelease";
                    action = {
                        type: "Keypress";
                        keys: [ "KEY_PLAYPAUSE" ];
                    }
                },
                {
                    direction: "Down";
                    mode: "OnRelease";
                    action = {
                        type: "Keypress";
                        keys: [ "KEY_MUTE" ];
                    }
                },
                {
                    direction: "Left";
                    mode: "OnRelease";
                    action = {
                        type: "Keypress";
                        keys: [ "KEY_PREVIOUSSONG" ];
                    }
                },
                {
                    direction: "Right";
                    mode: "OnRelease";
                    action = {
                        type: "Keypress";
                        keys: [ "KEY_NEXTSONG" ];
                    }
                }
            );
        };
    },
    //Gestures btn 
    {
        cid: 0xc3;
        action = {
            type: "Gestures";
            gestures: (
                {
                    direction: "None";
                    mode: "OnRelease";
                    action = {
                        type: "Keypress";
                        keys: [ "KEY_LEFTMETA", "KEY_TAB" ];
                    }
                },
                {
                    direction: "Up";
                    mode: "OnRelease";
                    action = {
                        type: "Keypress";
                        keys: [ "KEY_LEFTMETA", "KEY_UP" ];
                    }
                },
                {
                    direction: "Down";
                    mode: "OnRelease";
                    action = {
                        type: "Keypress";
                        keys: [ "KEY_LEFTCTRL", "KEY_F9" ];
                    }
                },
                {
                    direction: "Left";
                    mode: "OnRelease";
                    action = {
                        type: "Keypress";
                        keys: [ "KEY_LEFTMETA", "KEY_LEFT" ];
                    }
                },
                {
                    direction: "Right";
                    mode: "OnRelease";
                    action = {
                        type: "Keypress";
                        keys: [ "KEY_LEFTMETA", "KEY_RIGHT" ];
                    }
                }
            );
        };
    },
    //Top btn 
    {
        cid: 0xc4;
        action = {
            type: "Gestures";
            gestures: (
                {
                    direction: "None";
                    mode: "OnRelease";
                    action = {
                        type: "ToggleSmartShift";
                    }
                },
                {
                    direction: "Up";
                    mode: "OnRelease";
                    action = {
                        type: "ChangeDPI";
                        inc: 200;
                    }
                },
                {
                    direction: "Down";
                    mode: "OnRelease";
                    action = {
                        type: "ChangeDPI";
                        inc: -200;
                    }
                },
            );
        };
    },
  ),
  thumbwheel:
    {
        divert: true;
        invert: false;
        left:
        {
            threshold: 1;
            interval: 1;
            direction: "Left";
            mode: "OnInterval";
            action =
            {
                type: "Keypress";
                keys: ["KEY_VOLUMEDOWN"];
            };
        };
        right:
        {
            threshold: 1;
            interval: 1;
            direction: "Right";
            mode: "OnInterval";
            action =
            {
                type: "Keypress";
                keys: ["KEY_VOLUMEUP"];
            };
        };
        tap:
        {
            mode: "OnRelease";
            action =
            {
                type: "Keypress";
                keys: ["KEY_LEFTCTRL", "KEY_PLUS"];
            }
        }
    };
}
)