libddcci

Linux userspace library for monitor control via DDC/CI & VCP codes.

Many parts are adapted from ddccontrol.

Requirements

This library only supports use of the i2c devices exposed by graphics cards, and doesn't try to do any of the pci direct memory access that ddccontrol uses.

Building

cmake .
make

Roadmap

1. support issuing commands to benq z-series monitors

• create linux benq strobe utility

2. use polkit to gain access to i2c devices instead of requiring sudo chmod a+rw /dev/i2c-*
3. support controls covered by ddccontrol, hopefully with autodetection

• probably update/fork ddccontrol to use this library

4. python & nodejs/iojs bindings
5. cross platform

Design Philosophy

Userspace only.

Troubleshooting

Doesn't work on Nvidia cards?

Add to xorg.conf or xorg.conf.d:

Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    Option "RegistryDwords" "RMUseSwI2c=0x01; RMI2cSpeed=100"
EndSection

(source)

Notes

require i2ctools svn version use include/i2c/smbus.h