On Mon, May 10, 2021 at 06:12:47PM +0000, 'awokd' via qubes-users wrote:
> 'Joanna Anders' via qubes-users:
> > 
> > I'm trying to make Trezor Model T work on my Qubes system installed on a
> > ssd *usb drive* according to this guide https://wiki.trezor.io/Qubes_OS .
> > So by default the *sys-usb qube is disabled*. If I try to enable it my
> > whole system turns unusable.
> > 
> > Should I edit the *sys-net* qube instead of nonexistent *sys-usb* ?
> > 
> If I'm not mistaken, running Qubes directly from a USB drive requires dom0
> to own at least the USB controller responsible for the drive. This would
> mean you would have to run the trezor service there as well, but as dom0's
> networking is disabled, wouldn't get you any further. Unfortunately, think
> you pretty much require a sys-usb. If you have more than one controller
> driving the external ports (fairly unusual on laptops, though) you may be
> able to assign a single unused controller to a sys-usb qube and use the
> Trezor device on those specific ports. Not an option if your drive is on one
> of the same ports. Other option could be to install Qubes on local disk
> instead of USB.
> 

Is it unusual to have more than one controller on a laptop? Venerable
old Thinkpads had 2 or 3, and you could easily keep one for dom0 and the
other(s) for sys-usb purposes.
But you're not mistaken - if you only have 1 controller, you cant
allocate that to a sys-usb while running from usb.

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