Hi,

I bought a second internal USB controller (A) to connect a flash drive for 
booting from SD.

How can I prevent the internal controller(B) (with the keyboard attached) to be 
recognized during startup? I can still type my boot password with it, that 
means the controller is visible, right?

So how can I configure Qubes OS to:

1) At boot time, only controller (A) should be attached to dom0. Controller (B) 
should be unable to affect Qubes OS maliciously
2) After boot, controller (A) should be attached to dom0, controller (B) to 
sys-usb.
3) hide-all-usb does not seems to support this. How can I configure Grub to 
ignore all usb controllers except one specific one?

Cheers
Chris

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