null
    Discard all samples (playback) or generate zero samples (capture)
pulse
    PulseAudio Sound Server
default:CARD=Audio
    Intel HDMI/DP LPE Audio, Intel HDMI/DP LPE Audi
    Default Audio Device
sysdefault:CARD=Audio
    Intel HDMI/DP LPE Audio, Intel HDMI/DP LPE Audi
    Default Audio Device
hdmi:CARD=Audio,DEV=0
    Intel HDMI/DP LPE Audio, Intel HDMI/DP LPE Audi
    HDMI Audio Output
hdmi:CARD=Audio,DEV=1
    Intel HDMI/DP LPE Audio, Intel HDMI/DP LPE Audi
    HDMI Audio Output
default:CARD=rt5640
    sof-bytcht rt5640, 
    Default Audio Device
sysdefault:CARD=rt5640
    sof-bytcht rt5640, 
    Default Audio Device
