The ALC1150 chip on this motherboard fails to mix all channels played at it a simple,
pcm.!default{ type hw card 1 }
Works but fails in mixing and does not take in SND_PCM_FORMAT_FLOAT inputs(may be because it is writing directly to the card’s buffer which doesn’t support float inputs). The fix is to use dmix but a lot of the dmix setups I used didn’t work at all, all ended in “can’t open output” errors. Put the following in /etc/asound.conf and it’ll work like a charm, no need for sound servers! It is a modified version of the conf found in http://wiki.gentoo.org/wiki/ALSA.
pcm.dmixed { type asym playback.pcm { type dmix ipc_key 5678293 ipc_perm 0660 ipc_gid audio slave { channels 2 # make 6 or 5.1 channel pcm { format S16_LE # S32_LE rate 48000 # can also be 44100 type hw card 1 # your card device 0 # your device subdevice 0 #important? } period_size 1024 buffer_size 8192 } bindings { 0 0 1 1 # Uncomment below if using 6 channel # 2 2 # 3 3 # 4 4 # 5 5 } } capture.pcm "hw:0" } pcm.!default { type plug slave.pcm "dmixed" }