Sys-usb dom0 / mouse

[apparatus]

@zeb981

First being that sys-usb is connecting to dom0. In global settings I have it set to ask before connecting a mouse. When prompted upon login I can only select dom0. How do I get an option other than dom0?

What other option do you expect there?
If you want to use USB mouse input in dom0 then you need to pass in to dom0.
Or do you want to use you USB mouse in just one specific qube that don’t have Qubes OS GUI integration (e.g. full desktop instead of seamless app windows)?

@zeb981

Second problem is that once sys-usb is connected, it connects 5 usb devices, one being the mouse and the other 4 that should certainly not be given any permissions (webcam etc…). How might I limit the usb connections to just the mouse? Im guessing this means they’re all using the same PCI. Is there anything I can do about this?

qubes.InputMouse is not attaching the USB mouse to dom0 as USB device, it’s only passing the input from the USB mouse in sys-usb to the virtual input device created in dom0.
So it’s not passing any actual USB device to dom0.
Also read this:

Device handling security

@zeb981

Edit: Using a laptop and booting from a live usb so things like usbcore.authorized_default=0 and rd.qubes.hide_pci would cause problems no? I know that having either in boot parameters prevents booting.

Yes, it’ll cause problems.
Read this topic:

Using USB blocks in an usb-installed QubesOS

Hi folks, I’m a noob and all I’ve searched about my problem didn’t help me till here. If ever you have some links about already answered similar problem, please tell me. I’ve got a problem using usb memory sticks in my usb-installed QubesOS. I can see my USB stick in the list of devices, can attach them to Personal Qube for example. But it doesn’t show up in Thunar FileManager. Also, I noticed USB stick seems to be directly “linked” to dom0, and not to sys-usb qube. Listing the usb devices i…