I can confirm with the same device and Ubuntu rather than Mint.
Starting from a new install of Ubuntu 20.04.3 LTS with kernel 5.11.0-38,
sound works fine. I am offered an update to kernel 5.13.0-27 via the
package manager, after switching to this kernel sound does not work.
Tested using the Gnome Control Centre Sound test ("front left...")
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https://bugs.launchpad.net/bugs/1958410
Title:
bytcr_rt5640 sound not working with kernel >= 5.13
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