Linux ALSA information

The Linux Advanced Linux Sound Architecture (ALSA) is the standard audio system for many years. The following .asoundrc file can be used to configure alsa to use the HDMI audio device of a (NVidia) graphics card. The HDMI audio is configured as the default device. The typical onboard AC'97 or HD Audio device is available as another named device.

# ALSA configuration for on board high definition audio
# and a NVidia HDMI audio (default).

pcm.onboard {
	type hw
	card 0
}
ctl.onboard {
	type hw
	card 0
}

pcm.nvidia {
	type hw
	card 0
	device 3
}
ctl.nvidia {
	type hw
	card 0
	device 3
}

pcm.dmixer {
 	type dmix
 	ipc_key 1024
 	slave {
		pcm "hw:1,3"
		#period_time 0
		#period_size 1024
		#buffer_size 4096
		rate 44100
		channels 2
		format S16_LE
	}
	bindings {
		0 0
		1 1
	}
}

# 'dsp0' is expected by OSS emulation etc.
pcm.dsp0 {
    type plug
    slave.pcm "dmixer"
}

pcm.!default {
	type plug
	slave.pcm "dmixer"
}

ctl.!default {
	type hw
	card 1
	device 3
}