https://bugs.freedesktop.org/show_bug.cgi?id=94563
--- Comment #7 from Raymond <[email protected]> ---
It is the hda-intel driver which upmix stereo to 5.1 or 7.1
if card 1 is your hda intel with analog codec
speaker-test -c2 -t wav -D hw:1,0
You have to ask the author who wrote the patch
"feed front to surround"
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