Rollintundra

I have a rsb11 sound bar with sub. I have it setup through an hdmi arc with my tv. The hdmi cable is arc compatible. And cec is turned on, on the sound bar. The sound bar is working good. However when I watch something that is Dolby surround sound the sound stops. The Dolby light comes on the sound bar, but all sound stops. I am driving myself crazy with this issue. Any help would be appreciated. Btw the tv is a Sony xbr65