Scrolling

OpenLogi separates host-side physical-wheel behavior from settings written to a specific mouse. This keeps trackpad scrolling native while letting you smooth or scale a traditional wheel, invert one mouse, and tune a thumb wheel. For the ratchet / free-spin feel of the main wheel, see SmartShift.

Physical wheel and trackpad

Open Settings → General for the app-wide controls:

• Smooth scrolling replaces eligible physical mouse-wheel ticks with a finite scroll animation. It is off by default.
• Vertical scroll sensitivity scales the distance of traditional vertical wheel input on a 1–100 scale; 14 is 1×. It applies even when smooth scrolling is off.

Continuous pixel input from a native trackpad is neither smoothed nor scaled. On macOS, OpenLogi also requires a known Logitech source before intercepting a wheel event; other sources pass through.

Per-device main wheel

Select a mouse and open Pointer. The wheel controls are capability-gated:

• Invert scroll direction — reverses this mouse's wheel without touching the system-wide setting, so a trackpad can keep natural scrolling while the mouse scrolls the traditional way. It is applied through the device's native HID++ wheel inversion, so the card greys out for devices that don't report support for it.
• Wheel resolution — Device default (OpenLogi doesn't change it), Standard (one scroll report per physical ratchet step), or High resolution (finer reports between ratchet steps), backed by HID++ 0x2121 hiResWheel.

Both values are stored in the config and re-applied over HID++ when the device reconnects. They are separate from smooth scrolling and vertical sensitivity.

Thumb wheel

On MX-line mice the horizontal thumb wheel is its own control:

• ThumbwheelScrollUp / ThumbwheelScrollDown bind each rotation direction, and Thumbwheel names its capacitive tap. Native rotation is normalized across models: physical up/forward scrolls left, and physical down/backward scrolls right.
• Thumb Wheel Sensitivity scales that scroll on a 1–100 scale, app-wide in Settings → General and per device from the SmartShift panel. It also changes how readily custom discrete wheel actions trigger.

The wheel keeps scrolling natively until you give OpenLogi a reason to take it over: it is diverted over HID++ 0x2150 only once the sensitivity leaves its default (14) or one of its bindings diverges from the default.

In the config

[app_settings]
smooth_scroll = true
vertical_scroll_sensitivity = 20  # 1–100; 14 is 1×
thumbwheel_sensitivity = 14       # app-wide thumb-wheel default

[devices."unit:6be9d300"]
invert_scroll = true
scroll_resolution = "high"        # "low", "high", or omit for the device default
thumbwheel_sensitivity = 30       # per-device override of the app-wide value

[devices."unit:6be9d300".bindings]
ThumbwheelScrollUp = "HorizontalScrollLeft"
ThumbwheelScrollDown = "HorizontalScrollRight"
# Optional and intentionally absent by default:
# Thumbwheel = "AppExpose"

Status: macOS + Linux + Windows, on devices that expose the matching HID++ features. See 0x2121 hiResWheel and 0x2150 thumbwheel for the protocol detail.