Hi, I have some initial code for jack sense implementation, the approach is to listen /dev/input/eventX and pass that data as argument to a new module called module-jack-detect where a thread wakes when the jack has been inserted. Using the current code I'm able to catch jack insertion and removal, next step is to signal PA core when the jack has been inserted so this calls a hook in the PA UCM module to load the ucm configuration for jack. So, I need to send a message to any other interested module but I'm sure how implement it, Can a hook be used to signal PA core? Any suggestions appreciated. Code is available at http://git.slimlogic.co.uk/cgi-bin/cgit.cgi/pulseaudio.git/log/?h=9.20-ucm_module Thanks in advance, Margarita