Yeah, would be too easy…
I notice that this issue appears when device configuration was changed.
Agreed. This most recent time I ran into this issue, I suspended the laptop with an external mouse plugged in, unplugged the mouse, and then woke up the computer. On wake up, the CPU speed was stuck at the lowest speed (400 MHz) and fan was going full bore.
Another suspend/wake cycle without changing anything brought back normal behavior.
Just stumbled over this topic again … and realized, that i didn’t have the fan revving up anymore since weeks.
By accident (my fault) i had my PureOS only overwritten by Debian. Being lazy (and not willing to open up another time-consuming task on a long list of work to do) i kept it as it is. Might be, switching to Debian did the job to calm down the fan.
Unfortunately i’m not sure. But wanted to mention it anyway.
I’m running Debian (sid), so it seems like you’ve just been lucky since switching 
This is a bios firmware thing. If you haven’t already i’d make sure you’ve updated it using the script present here on these forums. However, I believe the issue highlighted above has not yet been corrected. (That is if you unplug a device from a USB port while the device is in standby, and then resume, you will trigger the fan condition.)
That’s exactly what happened for me recently. Librem 13 v3. But I didn’t know how to fix it except to reboot, so thanks for that. Next time, I’ll just close the lid, sing Happy Birthday twice and open the lid.
Any news on that issue?
And besides, just found this: Librem 15v3 reveiw (1year) - This issue is around for 7 years and the best solution is still to close the lid and reopen it?
Never had this issue again, since upgrading coreboot to the newest release.
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Now that you mention that: I haven’t had it in quite a while either. Tend to keep my pureboot up to date. @ollrich: You might be the perfect person to test if that actually did it or if my hearing is failing 
Btw: Sometimes the fan still is on, but then usually because the indexer is running in the background, so there’s a reason for the fan.
I’m on a 13v2 but I too can’t remember the last time this happened to me. I would absolutely run the coreboot update script. It is distro agnostic.
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That’s good news, but the coreboot update is still beta, which gives me pause. Why hasn’t Purism moved this to production?
I don’t know, I just run the script.