I have my computer Windows 10 using HDMI out with sound set to Dolby Atmos for Home Theater connected to my Yamaha rx-v6a which is connected to my TV (which does have eARC if I need to switch to that?). Anytime sound is not actively being played my receiver displays "decoder off" and when I start to play sound/video it then takes 1-2 seconds before the audio begins at which point it reads "PCM" and not "Dolby Atmos". But it appears to be playing sound out of each channel properly, so my main concern is simply why all sound takes so long to begin playback, and why I can't have the decoder constantly running. This is most frustrating with video clips that are only 3-4 seconds long because the first 1-2 seconds constantly remain silent. Please excuse me if I have missed any details or used poor terminology, I am fairly new to the AV world.