First of all you need to find out sound cards indexes.
#> cat /proc/asound/cards
0 [PCH]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xf2520000 irq 42
29 [ThinkPadEC]: ThinkPad EC - ThinkPad Console Audio Control
ThinkPad Console Audio Control at EC reg 0x30, fw unknown
so HDA Intel PCH has index 0
#> /etc/asound.conf
pcm.!default {
type hw
card 0
}
ctl.!default {
type hw
card 0
}
cat /etc/modprobe.d/alsa-base
options snd-hda-intel model=laptop index=0
options snd-hda-intel model=thinkpad
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