And, yes, I did use it plugged into an Android phone using a USB-OTG adapter. What was I supposed to do? 😛
Actually, it didn't work on my Chromebook annoyingly. Stuck LEDs like I still had dried caps on the controller (characteristic failure of M2). Dunno if it's an OS issue - dmesg looks fine tho - or a power issue - but is my phone really driving more voltage out USB than a chromebook?
One thing I didn't bring: voltmeter. Ah well. Good try.
Late late follow-up: looks like it was some kind of USB 3 compatibility thing, based on the strange dmesg output I searched. Not sure if re enumeration due to Caterina bootloader is the cause, or if the keyboard boot hid descriptor is the confusion (since I guess it's a bit unorthodox by design), or what...
There are more weird USB compatibility issues out there than I had realized.
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