Update from 2014-09-12:
Here’s a solution for this issue (at least it works for me) courtesy of alexisdm (here’s his stack overflow profile). This snippet has to be added to the NVIDIA configuration file in /etc/X11/xorg.conf.d/*.conf:
Section "Device"
Driver "nvidia"
Identifier "Videocard0"
Option "RegistryDwords" "RMUseSwI2c=0x01; RMI2cSpeed=100"
EndSection
------------------------- The original message -------------------------
sudo ddccontrol -p
ddccontrol version 0.4.2
Copyright 2004-2005 Oleg I. Vdovikin (oleg@cs.msu.su)
Copyright 2004-2006 Nicolas Boichat (nicolas@boichat.ch)
This program comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of this program under the terms of the GNU General Public License.
Probing for available monitors.........
Detected monitors :
- Device: dev:/dev/i2c-0
DDC/CI supported: No
Monitor Name: LG (DVI)
Input type: Digital
No monitor supporting DDC/CI available.
If your graphics card need it, please check all the required kernel modules are loaded (i2c-dev, and your framebuffer driver).
Strangely:
i2cdetect -l
i2c-0 i2c NVIDIA i2c adapter 0 at 1:00.0 I2C adapter
i2c-1 i2c NVIDIA i2c adapter 2 at 1:00.0 I2C adapter
i2c-2 i2c NVIDIA i2c adapter 6 at 1:00.0 I2C adapter
i2c-3 i2c NVIDIA i2c adapter 7 at 1:00.0 I2C adapter
i2c-4 i2c NVIDIA i2c adapter 8 at 1:00.0 I2C adapter
i2c-5 i2c NVIDIA i2c adapter 11 at 1:00.0 I2C adapter
So does gddccontrol work for anyone here?
Edit: post your NVIDIA bug report in this topic.