I have added the DPMS device to the MM in question and told the system to use that device as the VideoDev in /etc/pluto/media_config.conf.
I dont think the media config is working. The file did not exist on my system so I created it. I have also set the AudioDev to the AppServer device which it says in the media config section of your wiki will allow ALSA to control the audio but that is not working either.
This is my media_config.conf so far.
Room=2: AudioDev=127; VideoDev=127; KeepScreenOnForOSD=no
Room=7: AudioDev=26; VideoDev=128; KeepScreenOnForOSD=no
The media_config.conf file needs to be created for your system - its not there by default. Double check that you have all of the values correct in your media_config.conf
What is the audio output device for each of the rooms listed above? ie what is it and how is it connected to your MM
All the best