Using the configuration file, it is possible to pass options directly to shared library ddcutil. The option string is read and processed when libddcutil is initialized. (Bear in mind that the shared library is not used by the command line program ddcutil. Specifying libddcutil options in this context has no effect.)
Generally speaking, any ddcutil option, other than those for display and feature selection, can be passed to libddcutil.
In addition, the following option is recognized only by libddcutil.:
libddcutil can redirect all output that would normally be sent to the terminal to a trace file instead, allowng for tracing when there is no terminal to which to write. This option specifies the file name. The file name specified can be either absolute or relative. If relative, the directory is resolved as per the definition of XDG_STATE_HOME in the XDG desktop specification. Typically, this is $HOME/.local/state/ddcutil.