Need help with ddcutil?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.

About the developer

rockowitz
455 Stars 19 Forks GNU General Public License v2.0 4.7K Commits 70 Opened issues

Description

Control monitor settings using DDC/CI and USB

Services available

!
?

Need anything else?

Contributors list

# 238,633
C
C++
Shell
ddc
4596 commits
# 179,886
libusb
glsl
ddc
Rails
2 commits
# 1,958
Go
Shell
golang
Linux
1 commit
# 52,731
curio
play-fr...
playfra...
MySQL
1 commit
# 24,436
Ansible
tempera...
thinkpa...
Symfony
1 commit

ddcutil

ddcutil is a Linux program for querying and changing monitor settings, such as brightness and color levels.

Most monitors, other than laptop displays, have a Virtual Control Panel (VCP), which implements features defined in the Monitor Control Command Set (MCCS). Typically, ddcutil communicates with the monitor's VCP over an I2C bus, as per the Display Data Channel/Command Interface Standard (DDC/CI).

Alternatively, some monitors (e.g. Eizo ColorEdge, Apple Cinema) provide a USB interface to the VCP, as described in the USB Monitor Control Class Specification. ddcutil can communicate with these monitors over USB instead of I2C.

A particular use case for ddcutil is as part of color profile management. Monitor calibration is relative to the monitor color settings currently in effect, e.g. red gain. ddcutil allows color related settings to be saved at the time a monitor is calibrated, and then restored when the calibration is applied.

The tarball/github project builds both command line (ddcutil) and shared library (libddcutil) executables. The command line executable does not depend on the shared library.

For detailed information about ddcutil, see the project website: www.ddcutil.com.

In particular, for instructions on building ddcutil, see www.ddcutil.com/building.

Once ddcutil is installed, online help is also available. Use the --help option or see the man page: ~~~: $ ddcutil --help $ man 1 ddcutil ~~~

References to the relevant specifictions can be found at www.ddcutil.com/bibliography.

Installation Diagnostics

If ddcutil is successfully built but execution fails, command

ddcutil environment
probes the I2C environment and may provide clues as to the problem.

User Support

Please direct technical support questions, bug reports, and feature requests to the Issue Tracker on the github repository. Use of this forum allows everyone to benefit from individual questions and ideas.

When posting questions regarding ddcutil configuration, please execute the following command, capture its output in a file, and submit the output as an attachement.

$ ddcutil interrogate 

For further information about technical support, see https://www.ddcutil.com/tech_support.

Author

Sanford Rockowitz [email protected]

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.