ddcci

Spec sheet

Purpose

ddcci is a command-line tool for communicating with monitors through the DDC/CI interface.Read 9 Oct 2026 · github.com

Support

The maker says they accept patches and directs users to inspect the tool if it hangs or does not work.Read 9 Oct 2026 · bhuvanchandradv.github.io

License

The repository README describes the program as GPL-licensed.Read 9 Oct 2026 · github.com

Capabilities query

The -c option queries the monitor's DDC/CI capabilities string.Read 9 Oct 2026 · bhuvanchandradv.github.io

Compatibility limit

The page says the Mitsubishi Diamond Pro 2060u does not support capabilities requests.Read 9 Oct 2026 · github.com

Control discovery

The -d option queries controls 0 through 255 and checks their validity, with -f available to override the validity check.Read 9 Oct 2026 · bhuvanchandradv.github.io

Control names

The page says symbolic control names are based on Samsung SyncMaster 173T functionality and may be incorrect for other monitors.Read 9 Oct 2026 · bhuvanchandradv.github.io

Controls

It can query available monitor controls and read or write a specified control, including brightness.Read 9 Oct 2026 · bhuvanchandradv.github.io

EDID query

The -e option queries monitor EDID at I2C address 0x50.Read 9 Oct 2026 · bhuvanchandradv.github.io

Installation

The maker's page links to ZIP and tar.gz source downloads and to the GitHub repository.Read 9 Oct 2026 · bhuvanchandradv.github.io

Known limitation

The README says the Mitsubishi Diamond Pro 2060u does not support capability requests.Read 9 Oct 2026 · github.com

License and author

The repository README says the program is GPLed and written by Oleg I. Vdovikin.Read 9 Oct 2026 · github.com

Monitor compatibility

The maker says symbolic control names are based on Samsung SyncMaster 173T functionality and may be incorrect for other monitors.Read 9 Oct 2026 · bhuvanchandradv.github.io

Monitor controls

The page lists controls including brightness, contrast, input source, speaker volume, and power.Read 9 Oct 2026 · bhuvanchandradv.github.io

Monitor data

The tool can query monitor EDID at I2C address 0x50 and DDC/CI capabilities at address 0x37.Read 9 Oct 2026 · bhuvanchandradv.github.io

Read and write controls

The -r option selects a control to read or write, and -w supplies the value to write.Read 9 Oct 2026 · bhuvanchandradv.github.io

Samsung support

The -S option sends a Samsung DDC/CI enable command, which the page says some Samsung monitors seem to require.Read 9 Oct 2026 · bhuvanchandradv.github.io

Save settings

The -s option sends a DDC/CI command to save adjustments made with the write option.Read 9 Oct 2026 · github.com

Where Specifiction places it

• Monitor Control Software#18 of 247.1