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ddcutil is a Linux program for managing monitor settings, such as brightness, color levels, and input source. Generally speaking, any setting that can be changed by pressing buttons on the monitor can be modified by ddcutil.


USE flags

USE flags for app-misc/ddcutil Program for querying and changing monitor settings

X Add support for X11
drm Use x11-libs/libdrm for more verbose diagnostics.
introspection Add support for GObject based introspection
usb-monitor Adds support for monitors attached via USB.
user-permissions Adds a udev rules to allow non-root users in the i2c group to access the /dev/i2c-* devices. If usb-monitor is selected, users will need to be added to the video group to access the USB monitor. Otherwise, only root will be able to use ddcutil.


root #emerge --ask app-misc/ddcutil



Module i2c_dev should be loaded to allow ddcutil to work.

root #echo "i2c_dev" > /etc/modules-load.d/i2c_dev.conf
root #modprobe i2c_dev


Granting I2C Device Permissions on Versions Prior to 1.4.0:

It is necessary is to add users who will use ddcutil to group i2c

root #groupadd --system i2c
root #modprobe i2c_dev

Create udev rule for giving group i2c RW permission on the /dev/i2c devices

root #cp -v /usr/share/ddcutil/data/45-ddcutil-i2c.rules /etc/udev/rules.d