[gentoo-user] Why is "mtp-probe" running when I plug in a USB device?

[Grant Edwards]

I've noticed that whenever I plug in any sort of USB device,
"mtp-probe" runs and logs the fact that the newly attached thing "was
not an MTP device".

This appears to be triggered by a rule in

   /lib/udev/rules.d/69-libmtp.rules

which is owned by media-libs/libmtp

Why does that library think it should be probing every USB device I
plug in? Is that automatic probing required for libmtp and mtpfs to
work?

I do _not_ want anything to happen "automagically" when I plug in a
USB mtp device. I know if a device is an MTP device, and if I want it
mounted, I'll mount it manually.

--
Grant