Ladies and gentlemen,

I tested alsa on Kernel 5.2.2 on an MacBook Air 3,2 with alsa-lib 1.1.9, fftw 3.3.8, ncurses 6.1. Somehow I was not able to get the right speaker to work. On Kernel 4.19.60 everything works. Same setup different results. Distribution: Arch Linux

lsmod | grep snd

snd_hda_codec_hdmi 65536 3 snd_hda_codec_cirrus 20480 1 snd_hda_codec_generic 94208 1 snd_hda_codec_cirrus ledtrig_audio 16384 1 snd_hda_codec_generic snd_hda_intel 49152 0 snd_hda_codec 155648 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_ci rrus snd_hda_core 102400 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,sn d_hda_codec_cirrus snd_hwdep 16384 1 snd_hda_codec snd_pcm 135168 4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_core snd_timer 40960 1 snd_pcm snd 106496 7 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hd a_codec,snd_timer,snd_pcm soundcore 16384 1 snd

aplay -L

null Discard all samples (playback) or generate zero samples (capture) default:CARD=NVidia HDA NVidia, CS4206 Analog Default Audio Device sysdefault:CARD=NVidia HDA NVidia, CS4206 Analog Default Audio Device front:CARD=NVidia,DEV=0 HDA NVidia, CS4206 Analog Front speakers surround21:CARD=NVidia,DEV=0 HDA NVidia, CS4206 Analog 2.1 Surround output to Front and Subwoofer speakers surround40:CARD=NVidia,DEV=0 HDA NVidia, CS4206 Analog 4.0 Surround output to Front and Rear speakers surround41:CARD=NVidia,DEV=0 HDA NVidia, CS4206 Analog 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=NVidia,DEV=0 HDA NVidia, CS4206 Analog 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=NVidia,DEV=0 HDA NVidia, CS4206 Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=NVidia,DEV=0 HDA NVidia, CS4206 Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers iec958:CARD=NVidia,DEV=0 HDA NVidia, CS4206 Digital IEC958 (S/PDIF) Digital Audio Output hdmi:CARD=NVidia,DEV=0 HDA NVidia, HDMI 0 HDMI Audio Output hdmi:CARD=NVidia,DEV=1 HDA NVidia, HDMI 0 HDMI Audio Output hdmi:CARD=NVidia,DEV=2 HDA NVidia, HDMI 0 HDMI Audio Output

aplay -l

**** List of PLAYBACK Hardware Devices **** card 0: NVidia [HDA NVidia], device 0: CS4206 Analog [CS4206 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: NVidia [HDA NVidia], device 1: CS4206 Digital [CS4206 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: NVidia [HDA NVidia], device 7: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: NVidia [HDA NVidia], device 8: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0

ls -l /dev/snd

total 0 drwxr-xr-x 2 root root 60 Jul 25 14:25 by-path crw-rw---- 1 root audio 116, 12 Jul 25 14:25 controlC0 crw-rw---- 1 root audio 116, 8 Jul 25 14:25 hwC0D0 crw-rw---- 1 root audio 116, 9 Jul 25 14:25 hwC0D3 crw-rw---- 1 root audio 116, 10 Jul 25 14:25 hwC0D4 crw-rw---- 1 root audio 116, 11 Jul 25 14:25 hwC0D5 crw-rw---- 1 root audio 116, 3 Jul 25 14:25 pcmC0D0c crw-rw---- 1 root audio 116, 2 Jul 25 14:25 pcmC0D0p crw-rw---- 1 root audio 116, 4 Jul 25 14:25 pcmC0D1p crw-rw---- 1 root audio 116, 5 Jul 25 14:25 pcmC0D3p crw-rw---- 1 root audio 116, 6 Jul 25 14:25 pcmC0D7p crw-rw---- 1 root audio 116, 7 Jul 25 14:25 pcmC0D8p crw-rw---- 1 root audio 116, 1 Jul 25 14:25 seq crw-rw---- 1 root audio 116, 33 Jul 25 14:25 timer