null Discard all samples (playback) or generate zero samples (capture) hdmi:CARD=HDMI,DEV=0 HDA Intel HDMI, Generic Digital HDMI Audio Output default:CARD=PCH HDA Intel PCH, Generic Analog Default Audio Device sysdefault:CARD=PCH HDA Intel PCH, Generic Analog Default Audio Device front:CARD=PCH,DEV=0 HDA Intel PCH, Generic Analog Front speakers surround21:CARD=PCH,DEV=0 HDA Intel PCH, Generic Analog 2.1 Surround output to Front and Subwoofer speakers surround40:CARD=PCH,DEV=0 HDA Intel PCH, Generic Analog 4.0 Surround output to Front and Rear speakers surround41:CARD=PCH,DEV=0 HDA Intel PCH, Generic Analog 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=PCH,DEV=0 HDA Intel PCH, Generic Analog 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=PCH,DEV=0 HDA Intel PCH, Generic Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=PCH,DEV=0 HDA Intel PCH, Generic Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers