Don't know if you resolved this, but my laptop had the same issue (older XPS laptop running linux. In my case, am update from the 5.10 kernel to 5.13 solved it (the mic was working on an older 5.4 kernel, which made suspect kernel regression). If you've got the realtek hardware, and are running around the 5.10 kernel, try upgrading (or downgrading) the kernel, as it appears the hdaudio driver has a big in the 5.10-ish kernels
krb3e
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July 5th, 2021 13:00
Don't know if you resolved this, but my laptop had the same issue (older XPS laptop running linux. In my case, am update from the 5.10 kernel to 5.13 solved it (the mic was working on an older 5.4 kernel, which made suspect kernel regression). If you've got the realtek hardware, and are running around the 5.10 kernel, try upgrading (or downgrading) the kernel, as it appears the hdaudio driver has a big in the 5.10-ish kernels