I know that this issue might've been reported, but it's relevant as of GRUB 2.14.
GRUB does not, under any circumstance, release handles of USB devices once they're unplugged. I am using the Coreboot payload and if i plug and unplug the usb i will create an N amount of (usbX) handles. On Linux, this wreaks havoc, having errors such as: `usb3-portX cannot enable. usb cable bad?`. This **can** lead to a panic if you use a LiveCD for instance. I also want to comment on the fact that on devices like the T480 USB does not work outright. It works on the X230T. I know that manpower is spread thin around GRUB but you still have a throne as a Coreboot payload. Cheers.
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