OMG I've been living for 3 years with a horrible hissing sound when using headphones on my laptop (only happens on Linux, but I removed Windows a while ago).
Today I randomly increased the "Headphone mic boost" value in alsamixer because I pressed the wrong key, and the hissing is gone, while the main volume dropped by like 50% (but I can compensate for that by increasing the volume).
Why would the mic boost make hissing disappear when the mic is disabled? Or affect the main volume, for that matter?????
@jon_valdes This reminds me of the genre of anguished posts: "argh, why does using my mouse make my speakers hiss", including such favourites as "and why does muting my line in fix it???" https://alex.blog/2010/02/23/high-pitched-noise-over-speakers-when-moving-mouse/
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