~$ aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
hw:CARD=HDMI,DEV=3
    HDA ATI HDMI, HDMI 0
    Direct hardware device without any conversions
hw:CARD=HDMI,DEV=7
    HDA ATI HDMI, HDMI 1
    Direct hardware device without any conversions
hw:CARD=HDMI,DEV=8
    HDA ATI HDMI, HDMI 2
    Direct hardware device without any conversions
hw:CARD=HDMI,DEV=9
    HDA ATI HDMI, HDMI 3
    Direct hardware device without any conversions
hw:CARD=HDMI,DEV=10
    HDA ATI HDMI, HDMI 4
    Direct hardware device without any conversions
hw:CARD=HDMI,DEV=11
    HDA ATI HDMI, HDMI 5
    Direct hardware device without any conversions
plughw:CARD=HDMI,DEV=3
    HDA ATI HDMI, HDMI 0
    Hardware device with all software conversions
plughw:CARD=HDMI,DEV=7
    HDA ATI HDMI, HDMI 1
    Hardware device with all software conversions
plughw:CARD=HDMI,DEV=8
plughw:CARD=HDMI,DEV=9
    HDA ATI HDMI, HDMI 3
    Hardware device with all software conversions
plughw:CARD=HDMI,DEV=10
    HDA ATI HDMI, HDMI 4
    Hardware device with all software conversions
plughw:CARD=HDMI,DEV=11
    HDA ATI HDMI, HDMI 5
    Hardware device with all software conversions
hdmi:CARD=HDMI,DEV=0
    HDA ATI HDMI, HDMI 0
    HDMI Audio Output
hdmi:CARD=HDMI,DEV=1
    HDA ATI HDMI, HDMI 1
    HDMI Audio Output
hdmi:CARD=HDMI,DEV=2
    HDA ATI HDMI, HDMI 2
    HDMI Audio Output
hdmi:CARD=HDMI,DEV=3
    HDA ATI HDMI, HDMI 3
    HDMI Audio Output
hdmi:CARD=HDMI,DEV=4
    HDA ATI HDMI, HDMI 4
    HDMI Audio Output
hdmi:CARD=HDMI,DEV=5
    HDA ATI HDMI, HDMI 5
    HDMI Audio Output
dmix:CARD=HDMI,DEV=3
    HDA ATI HDMI, HDMI 0
    Direct sample mixing device
dmix:CARD=HDMI,DEV=7
    HDA ATI HDMI, HDMI 1
    Direct sample mixing device
dmix:CARD=HDMI,DEV=8
    HDA ATI HDMI, HDMI 2
    Direct sample mixing device
dmix:CARD=HDMI,DEV=9
    HDA ATI HDMI, HDMI 3
    Direct sample mixing device
dmix:CARD=HDMI,DEV=10
    HDA ATI HDMI, HDMI 4
    Direct sample mixing device
dmix:CARD=HDMI,DEV=11
    HDA ATI HDMI, HDMI 5
    Direct sample mixing device
hw:CARD=Generic,DEV=0
    HD-Audio Generic, ALC1220 Analog
    Direct hardware device without any conversions
hw:CARD=Generic,DEV=1
    HD-Audio Generic, ALC1220 Digital
    Direct hardware device without any conversions
plughw:CARD=Generic,DEV=0
    HD-Audio Generic, ALC1220 Analog
    Hardware device with all software conversions
plughw:CARD=Generic,DEV=1
    HD-Audio Generic, ALC1220 Digital
    Hardware device with all software conversions
default:CARD=Generic
    HD-Audio Generic, ALC1220 Analog
    Default Audio Device
sysdefault:CARD=Generic
    HD-Audio Generic, ALC1220 Analog
    Default Audio Device
front:CARD=Generic,DEV=0
    HD-Audio Generic, ALC1220 Analog
    Front output / input
surround21:CARD=Generic,DEV=0
    HD-Audio Generic, ALC1220 Analog
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=Generic,DEV=0
    HD-Audio Generic, ALC1220 Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=Generic,DEV=0
    HD-Audio Generic, ALC1220 Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Generic,DEV=0
    HD-Audio Generic, ALC1220 Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Generic,DEV=0
    HD-Audio Generic, ALC1220 Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Generic,DEV=0
    HD-Audio Generic, ALC1220 Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Generic,DEV=0
    HD-Audio Generic, ALC1220 Digital
    IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=Generic,DEV=0
    HD-Audio Generic, ALC1220 Analog
    Direct sample mixing device
dmix:CARD=Generic,DEV=1
    HD-Audio Generic, ALC1220 Digital
    Direct sample mixing device