DisplayManager (DisplayFlow)

Cross-platform display configuration toolkit for Windows (Windows CCD / GDI / DDC/CI) and Linux (Wayland / wlroots / DRM / I2C-DDC). Cargo workspace with three library crates and one application.

Members

Path	Purpose
crates/df_ddc	DDC/CI monitor control backend (brightness, contrast, input, power)
crates/df_displmgr	Display topology abstraction (modes, position, rotation)
crates/df_displmgr_info	EDID parser and hardware telemetry
apps/displaymanager_cli	Command-line frontend

Build

cargo build --release
cargo build -p displaymanager_cli --release

Binaries land in target/release/.

Architecture

                        ├─► df_displmgr (topology) ─► df_ddc (DDC/CI)
displaymanager_cli     ─┘                      ─► df_displmgr_info (EDID/telemetry)

df_displmgr is the central layer. df_ddc and df_displmgr_info are independent backends that the higher-level apps call.

Platform support

OS	Display config	DDC/CI
Windows 10/11	Windows CCD + GDI	EnumDisplayMonitors + HighLevelMonitorConfigurationAPI
Linux (Wayland)	wlroots output manager	I2C via /dev/i2c-* (ddcutil-style)
Linux (X11)	none	I2C via /dev/i2c-*

Requirements

• Rust 1.75+ (edition 2021)
• Windows: MSVC build tools, Windows 10 SDK
• Linux: libwayland-dev, libdrm-dev, i2c-dev kernel module, read/write access to /dev/i2c-*. Compositor must implement wlr-output-management (unstable).

Workspace commands

cargo test --workspace
cargo test -p df_ddc
cargo clippy --workspace --all-targets
cargo fmt --all

License

Each crate declares its own license in its Cargo.toml (MIT and/or Apache-2.0). The root workspace contains no additional code.

Author

Example CLI Usage

# List connected displays
displaymanager_cli list

# Get detailed information about a display
displaymanager_cli info --id 0

# Adjust brightness (0-100)
displaymanager_cli set-brightness --id 0 --value 75

API Reference

The crates expose the following public APIs:

• df_ddc: Functions for reading and writing DDC/CI VCP codes.
• df_displmgr: Types for representing display topology, modes, and positions.
• df_displmgr_info: Structures for parsing EDID data and extracting telemetry.

Refer to the generated documentation on docs.rs for detailed usage examples.

piot5 — https://github.com/piot5