OK, here's a mystery for you. For over a decade, every July someone has posted this exact question to LKML. My theory is it's being sent by a ghost trapped in a PC speaker looking for help to pass on... 
pic.twitter.com/DCvixH5vCq
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(PC speaker though idk, I'd guess not unless some on-board voltages could be messed with via PMICs or whatever)
You used to be able to melt the speakers in Samsung ARM Chromebooks just by pulling up alsamixer after enabling dev mode and tweaking settings. Happened to me. I was pissed off, that's a kernel bug, userspace shouldn't be able to blow hardware.
