Trying to pass Atmos to receiver / need help.

    I installed LibreELEC onto a spare computer I had sitting around. It has a Radeon HD 6770 850M video card and I'm outputting video via HDMI. I went into the Kodi settings to change to bitstream output, but it appears to only be recognizing the onboard analog audio card built onto the motherboard. Is anyone aware of something I'm not doing that will get it to pass the audio through the HDMI? I'm getting picture just fine so I know it sees it. Just no audio. If I need to drop a log file let me know and I'll try to figure out how to do so. Thanks in advance.