I found a work-around here:
https://ubuntuforums.org/showthread.php?t=2357875
Using hdajackretask:
I set pin 0x14 to "Internal Speaker"
0x17 to "Internal Speaker LFE"
0x1b to "Internal Speaker (Back)"
The laptop sounds _much_ better now.
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https://bugs.launchpad.net/bugs/1672822
Title:
sound only coming from left speaker on acer predator (fresh install)
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