/dev/i2c-* devices are only working with
kernel 2.6 or greater.
If your graphics card is supported by /dev/i2c-* devices (see Appendix C,
Supported graphics cards), you must load the
i2c-dev module by typing, as
root:
# modprobe i2c-dev
You must also load your graphics card framebuffer driver (for card-specific instructions see Appendix C, Supported graphics cards).
If you want to automatically load these modules when Linux starts, see your distribution's documentation.
On systems not using devfs, even after loading framebuffer
and i2c-dev modules, the devices /dev/i2c/* or /dev/i2c-* does not exists. On Debian, these
devices are created using this command :
# /sbin/MAKEDEV i2c
To allow standard (i.e. non-root) users to use DDCcontrol,
you must change permissions on /dev/i2c-*. This is done by typing, as
root:
# chmod a+rw /dev/i2c-*
If i2c-dev or your graphics
card's framebuffer modules are not available with your
kernel, you can build your own kernel with the following
options turned on (with recommend to build them as
modules):