I was going to say “I don’t have external speakers to unplug” but that’s not entirely true. I have an external monitor. I unplugged it before I walked away from the computer last time and sure enough, it stayed muted on resume without the monitor plugged in.
I had a feeling jack sense may be the culprit because you didn’t mention any audio automation packages/configs.
If that resolved the issue maybe mark it as the solution, & consider disabling jack sense if possible, might be in BIOS or alsamixer > F6 to select your sound card, look for toggles like “Auto-Mute Mode”.
Try this in the command line.
type aslamixer, press F6, select your primary soundcard (HDMI monitors will cause extras to appear, one will be a system monitor virual card kind of dealy)
Adjust volumes to your chosen set point
exit back to terminal
type sudo alsactl store to store that preset for whenever the computer reboots.
occasionally this will get reset during an update, and you might have to do it again.
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