Even after blacklisting the default card (and a proper poweroff, then reboot), alsa still doesn't work by itself, but only through jack.
I modified /etc/modprobe.d/blacklist.conf as:
blacklist snd_hda_intel


I also tried from https://wiki.archlinux.org/index.php/Advanced_Linux_Sound_Architecture
pcm.!default {
    type hw
    card USB
}

ctl.!default {
    type hw
    card USB
}

Finally fixed :D !!!

Not sure the blacklisting  is useful though.

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