Configuration

JuhRadial MX is configured through plain JSON files under your XDG config directory. The Settings app (GTK4) writes these files for you, but every value is human readable and safe to edit by hand. This page is the full reference: where the files live, every top-level section and its key fields, the theme list, the per-application profile format, and autostart.

See also: Features for what each setting does in practice, Installation for first run, and Troubleshooting if a change does not take effect.

File locations

All configuration lives in ~/.config/juhradial/ (or $XDG_CONFIG_HOME/juhradial/ when that variable is set).

File / directory	Written by	Purpose
config.json	Settings app, daemon	Main configuration: haptics, buttons, thumb-wheel, theme, scroll, flow, gaming, app and device settings
profiles.json	Settings app, daemon	Per-application radial layouts and per-app hardware overrides
macros/<uuid>.json	Settings app	One file per saved macro
~/.config/autostart/juhradial-mx.desktop	Settings app	Login autostart entry (created/removed by the Start at Login toggle)

Note

The daemon reads haptics, theme, blur_enabled, buttons, and thumbwheel from config.json. The remaining sections (scroll, pointer, flow, gaming, app, device_mode, desktop_environment, language, radial, radial_menu) are consumed by the Settings app and overlay and applied through helper scripts or D-Bus. Unknown keys are ignored, so the two consumers coexist in one file.

How configuration is applied

• The Settings app writes config.json atomically (temp file plus rename) and then calls the daemon's ReloadConfig method over D-Bus (org.kde.juhradialmx on path /org/kde/juhradialmx/Daemon). Changes apply live, no restart required.
• If you edit config.json by hand, trigger a reload so the daemon picks it up. Either open and save once in the Settings app, or restart the daemon:

systemctl --user restart juhradialmx-daemon.service

• Missing fields fall back to defaults, so a minimal {} file is valid. On first run the Settings app auto-detects your desktop environment and fills in environment-appropriate commands for the radial slices (controlled by the internal de_defaults_applied flag).

Warning

The daemon writes only VOLATILE HID++ state to the device (no onboard-memory writes). Diverts and hardware overrides are re-applied on reconnect and on ReloadConfig, so a hotplugged mouse comes back to your configured state automatically.

Top-level structure of config.json

{
  "haptics": { ... },
  "theme": "catppuccin-mocha",
  "blur_enabled": true,
  "buttons": { ... },
  "thumbwheel": { ... },
  "radial": { "minimal_mode": false },
  "radial_menu": { ... },
  "scroll": { ... },
  "pointer": { ... },
  "flow": { ... },
  "gaming": { ... },
  "app": { ... },
  "device_mode": "auto",
  "desktop_environment": "auto",
  "language": "system"
}

Section	Type	What it controls
haptics	object	Haptic feedback patterns and debounce timing
theme	string	Active UI / overlay theme (see Themes)
blur_enabled	bool	Overlay blur effect (auto-disabled on slow GPUs)
buttons	object	Physical button action assignments
thumbwheel	object	Thumb-wheel behaviour (volume / scroll / zoom / off)
radial	object	Radial menu display options (minimal_mode)
radial_menu	object	The 8 radial slices, easy-switch options
scroll	object	Scroll direction, smoothness, SmartShift
pointer	object	Pointer speed, DPI, acceleration
flow	object	Multi-machine edge flow (created once configured)
gaming	object	Gaming mode and DPI profiles (created once configured)
app	object	Tray icon and autostart toggles
device_mode	string	UI layout: auto, logitech, or generic
desktop_environment	string	DE for default commands: auto, kde, gnome, cosmic, generic
language	string	UI language (system or a locale code)

Haptics

"haptics": {
  "enabled": true,
  "default_pattern": "subtle_collision",
  "per_event": {
    "menu_appear": "damp_state_change",
    "slice_change": "subtle_collision",
    "confirm": "sharp_state_change",
    "invalid": "angry_alert"
  },
  "debounce_ms": 20,
  "slice_debounce_ms": 20,
  "reentry_debounce_ms": 50
}

Field	Type	Default	Meaning
enabled	bool	true	Master toggle for haptic feedback
default_pattern	string	subtle_collision	Fallback waveform when no per-event pattern is set
per_event.menu_appear	string	damp_state_change	Pulse when the radial menu opens
per_event.slice_change	string	subtle_collision	Pulse when hovering a different slice
per_event.confirm	string	sharp_state_change	Pulse when selecting an action
per_event.invalid	string	angry_alert	Pulse for a blocked or invalid action
debounce_ms	int	20	Minimum milliseconds between any two pulses
slice_debounce_ms	int	20	Minimum milliseconds between slice-change pulses
reentry_debounce_ms	int	50	Window that suppresses a duplicate pulse when the cursor re-enters the same slice

Pattern names are MX Master 4 HID++ waveform IDs (for example subtle_collision, damp_state_change, sharp_state_change, angry_alert). Pick from the patterns offered in the HAPTIC FEEDBACK page of the Settings app.

Buttons

Each physical control maps to one action. Defaults preserve the mouse's native behaviour.

"buttons": {
  "gesture": "virtual_desktops",
  "thumb": "radial_menu",
  "middle": "middle_click",
  "shift_wheel": "smartshift",
  "forward": "forward",
  "back": "back",
  "horizontal_scroll": "scroll_left_right"
}

Field	Physical control	Default action
gesture	Gesture button (thumb pad)	virtual_desktops
thumb	Actions-ring / haptic button	radial_menu
middle	Scroll-wheel click	middle_click
shift_wheel	Mode-shift button below the wheel	smartshift
forward	Upper thumb button	forward
back	Lower thumb button	back
horizontal_scroll	Thumb wheel	scroll_left_right

Available action values

Any button field accepts one of these snake_case values:

radial_menu        virtual_desktops    middle_click       back
forward            copy                paste              undo
redo               screenshot          smartshift         scroll_left_right
volume_up          volume_down         play_pause         mute
zoom_in            zoom_out            show_desktop       switch_desktop_left
switch_desktop_right  task_switcher    close_window       lock_screen
calculator         none                custom

none disables the button. custom reserves the slot for a user-defined action configured in the UI.

Warning

The gesture and actions-ring (thumb) buttons are always diverted to the daemon. The back, forward, middle, and shift-wheel buttons are only HID++-diverted when you reassign them away from their native default. Leaving one at its default keeps the firmware behaviour intact (and reassigning back to the default releases the divert without a reconnect). Reassigning horizontal_scroll is recorded in the schema but the thumb wheel's native scroll is handled by the thumbwheel section below.

Thumb-wheel

"thumbwheel": {
  "mode": "off",
  "invert": false,
  "speed": 1
}

Field	Type	Default	Meaning
mode	string	off	off, volume, scroll, or zoom
invert	bool	false	Reverse rotation direction (applied in software)
speed	int	1	Action repeats per rotation tick, clamped to 1 to 8

How modes behave:

• off and scroll use the wheel's native hardware behaviour and are not diverted, so horizontal scroll works reliably on every compositor.
• volume and zoom are diverted: each rotation tick is re-injected as Volume Up/Down or Ctrl +/- the number of times set by speed.

Radial menu

Display options

"radial": {
  "minimal_mode": false
}

minimal_mode shows icons only (no slice labels) when true.

Slices

The 8-way ring is defined under radial_menu.slices. Each slice is an object:

{
  "label": "Play/Pause",
  "action_id": "play_pause",
  "type": "exec",
  "command": "playerctl play-pause",
  "color": "green",
  "icon": "media-playback-start-symbolic"
}

Slice field	Meaning
label	Text shown on the slice
action_id	Stable identifier used for default-command mapping
type	How the slice acts: exec, shortcut, emoji, settings, submenu, or none
command	For exec: a shell command. For shortcut: a key combo such as ctrl+c. Empty for other types
color	A theme color name (green, yellow, red, blue, mauve, pink, sapphire, teal, and so on)
icon	A freedesktop symbolic icon name, an emoji, or a path to .png / .svg / .ico

Slice type values:

Type	Behaviour
exec	Run command as a shell command
shortcut	Inject the key combination in command
emoji	Open the system emoji picker
settings	Open the JuhRadial MX Settings app
submenu	Open a nested ring
none	Do nothing

Tip

On first run the slice commands are auto-filled for your desktop environment. For example, the Screenshot slice becomes spectacle on KDE, gnome-screenshot --interactive on GNOME, cosmic-screenshot on COSMIC, and flameshot gui on generic desktops. Set desktop_environment to pin a specific mapping.

Easy-switch

"radial_menu": {
  "easy_switch_shortcuts": false,
  "easy_switch_host_os": ["linux", "unknown", "unknown"]
}

Field	Meaning
easy_switch_shortcuts	Enable easy-switch slot shortcuts in the ring
easy_switch_host_os	Host OS label per channel (1, 2, 3): linux, windows, mac, or unknown

Scroll and pointer

"scroll": {
  "natural": false,
  "smooth": true,
  "smartshift": true,
  "smartshift_threshold": 50,
  "mode": "smartshift"
},
"pointer": {
  "speed": 10,
  "acceleration": true
}

scroll field	Type	Default	Meaning
natural	bool	false	Invert scroll direction
smooth	bool	true	Hi-res (free-spin) scrolling versus ratchet clicks
smartshift	bool	true	Auto-disengage the ratchet on fast flicks
smartshift_threshold	int	50	Flick force (0 to 100) that triggers free-spin
mode	string	smartshift	Scroll mode selector
speed	int	(UI)	Scroll speed, written by the Point & Scroll page

pointer field	Type	Default	Meaning
speed	int	10	Pointer speed
acceleration	bool	true	Enable pointer acceleration
dpi	int	(UI)	Explicit DPI, written when set in the Point & Scroll page
accel_profile	string	adaptive	Acceleration profile when written by the UI

Flow

The flow section appears once you configure multi-machine edge flow on the FLOW page. Keys are written on demand:

Field	Type	Default	Meaning
enabled	bool	false	Master flow toggle
direction	string	right	Edge that crosses to the other machine (left / right)
share_clipboard	bool	true	Sync clipboard across machines
edge_trigger	bool	true	Cross when the pointer hits the screen edge
edge_sensitivity	int	50	Edge trigger sensitivity
monitor	string	""	Monitor whose edge triggers flow (empty = any)
hide_indicator	bool	false	Hide the on-screen flow indicator
extend_edge_zone	bool	false	Enlarge the edge activation zone

Gaming

The gaming section appears once you open the GAMING page. DPI profiles let you switch precision quickly.

"gaming": {
  "enabled": false,
  "suppress_overlay": true,
  "active_dpi_profile": 1,
  "dpi_profiles": [
    { "name": "Precision", "dpi": 400,  "color": "blue" },
    { "name": "Normal",    "dpi": 1000, "color": "green" },
    { "name": "Fast",      "dpi": 3200, "color": "red" }
  ]
}

Field	Type	Default	Meaning
enabled	bool	false	Gaming mode master toggle
suppress_overlay	bool	true	Hide the radial overlay while gaming
active_dpi_profile	int	1	Index into dpi_profiles
dpi_profiles	array	(3 built-ins)	Each entry has name, dpi, and color

Device mode and desktop environment

Field	Values	Meaning
device_mode	auto, logitech, generic	UI layout only. The daemon always runs both the MX and generic input loops, so both mice work regardless. generic hides the Logitech-only tabs (HAPTIC FEEDBACK, EASY-SWITCH, FLOW)
desktop_environment	auto, kde, gnome, cosmic, generic	Chooses default commands for radial slices
language	system or a locale code	UI language

App settings and autostart

"app": {
  "start_at_login": true,
  "show_tray_icon": true
}

Field	Type	Default	Meaning
start_at_login	bool	true	Launch the overlay/settings helper at login
show_tray_icon	bool	true	Show the system tray icon

Toggling Start at Login in the SETTINGS page creates or removes ~/.config/autostart/juhradial-mx.desktop:

[Desktop Entry]
Type=Application
Name=JuhRadial MX
Comment=Radial menu for Logitech MX Master
Exec=/usr/local/bin/juhradial-mx
Icon=juhradial-mx
Terminal=false
Categories=Utility;
X-GNOME-Autostart-enabled=true

The background daemon runs separately as a systemd user service installed at setup time:

systemctl --user enable --now juhradialmx-daemon.service
systemctl --user status juhradialmx-daemon.service

Themes

Set the active theme with the theme field, or pick it from the SETTINGS page (changes apply to both the overlay and the Settings UI). Use the key from the left column as the theme value.

Theme key	Display name	Style
phosphor	PHOSPHOR	Dark, obsidian with a single mint accent
juhradial-mx	JuhRadial MX	Dark, vibrant cyan accents
catppuccin-mocha	Catppuccin Mocha	Dark, pastel lavender accents
nord	Nord	Dark, arctic blue palette
dracula	Dracula	Dark, purple accents
catppuccin-latte	Catppuccin Latte	Light, pastel
github-light	GitHub Light	Light, clean
solarized-light	Solarized Light	Light, precision palette
3d-blossom	Pearl Blossom (3D)	Dark, pre-rendered rose-gold wheel
3d-neon	Neon Sci-Fi (3D)	Dark, cyberpunk neon wheel
3d-pastel	Dark Ember (3D)	Dark, golden ember wheel
3d-crystal	Golden Classic (3D)	Dark, ornamental golden wheel

The 3d-* themes render the ring from a pre-baked image; the others are drawn as vectors. To switch by hand:

"theme": "phosphor"

Note

If theme is missing, set to system, or names an unknown theme, the overlay falls back to phosphor. The default config.json written on install uses catppuccin-mocha. The companion blur_enabled flag controls the overlay's background blur and may be auto-disabled on slow GPUs.

Per-application profiles (profiles.json)

profiles.json holds per-app radial layouts and per-app hardware overrides, matched against the focused window's resource class (case-insensitive). The Settings app writes a flat shape: top-level keys are application names, plus one hardware map.

{
  "default": {
    "name": "default",
    "app_class": "default",
    "slices": []
  },
  "Firefox": {
    "name": "Firefox",
    "app_class": "Firefox",
    "slices": [ { "label": "Copy", "action_id": "copy", "type": "shortcut", "command": "ctrl+c" } ]
  },
  "hardware": {
    "Firefox": {
      "dpi": 1200,
      "smartshift": { "enabled": true, "threshold": 40 },
      "hires": true,
      "thumbwheel": "scroll"
    }
  }
}

Per-app radial entry

Field	Meaning
name	Display name of the profile
app_class	Window resource class to match
slices	Up to 8 slice objects (same shape as radial_menu.slices); padded to 8

Per-app hardware override

Each key under hardware is an application name mapping to a hardware profile. Every field is optional: only the fields present are applied while that app is focused, and each maps to a volatile HID++ setter. A missing field means "leave unchanged".

Field	Type	Maps to
dpi	int	Pointer DPI (ADJUSTABLE_DPI)
smartshift	object	{ "enabled": bool, "threshold": int } (HiResScroll SmartShift)
hires	bool	Hi-res (free-spin) vs ratchet scroll
thumbwheel	string	off, volume, scroll, or zoom (divert derived: any non-off mode diverts)
buttons	object	Per-button action overrides keyed by gesture / thumb / middle / back / forward / shift_wheel (recorded in the schema; applied via config, not as device state)

Note

The daemon also accepts a structured form with a top-level version, a profiles array, and a hardware map (schema v2). Older v1 files (no hardware map) load unchanged and are migrated automatically. The flat UI shape and the structured shape are both read; the built-in default profile is always present even if the file omits it.

Macros

Saved macros live one-per-file under ~/.config/juhradial/macros/<uuid>.json, each holding the macro's id, name, and recorded steps. Manage them from the MACROS page rather than editing the directory by hand.

Minimal example

A complete, valid config.json only needs the fields you want to change; everything else falls back to defaults.

{
  "theme": "phosphor",
  "blur_enabled": true,
  "buttons": {
    "gesture": "radial_menu",
    "thumb": "virtual_desktops"
  },
  "thumbwheel": { "mode": "volume", "invert": false, "speed": 2 },
  "haptics": { "enabled": true, "default_pattern": "subtle_collision" }
}

After editing by hand, reload with the Settings app or systemctl --user restart juhradialmx-daemon.service. If a value still does not take effect, check Troubleshooting and Compositor-Support.