On Pi 4 server with a monitor attached:
$ cat /proc/asound/cards 0 [b1 ]: bcm2835_hdmi - bcm2835 HDMI 1 bcm2835 HDMI 1 1 [Headphones ]: bcm2835_headpho - bcm2835 Headphones bcm2835 Headphones
On Pi 4 desktop:
$ cat /proc/asound/cards 0 [Headphones ]: bcm2835_headpho - bcm2835 Headphones bcm2835 Headphones 1 [vc4hdmi0 ]: vc4-hdmi - vc4-hdmi-0 vc4-hdmi-0 2 [vc4hdmi1 ]: vc4-hdmi - vc4-hdmi-1 vc4-hdmi-1
On Pi 4 server with a monitor attached:
$ cat /proc/asound/cards
bcm2835 HDMI 1
bcm2835 Headphones
0 [b1 ]: bcm2835_hdmi - bcm2835 HDMI 1
1 [Headphones ]: bcm2835_headpho - bcm2835 Headphones
On Pi 4 desktop:
$ cat /proc/asound/cards
bcm2835 Headphones
vc4-hdmi- 0
vc4-hdmi- 1
0 [Headphones ]: bcm2835_headpho - bcm2835 Headphones
1 [vc4hdmi0 ]: vc4-hdmi - vc4-hdmi-0
2 [vc4hdmi1 ]: vc4-hdmi - vc4-hdmi-1