I don’t know if there’s any way to make it work without sys-usb, but I’d still try to create a working sys-usb and find the source of your problem with sys-usb and display blanking.
Maybe you have multiple PCI USB controllers that are attached to sys-usb after creation and only one of them could cause your problem with display, so I’d try to create sys-usb in the same way as before but remove all USB controllers in sys-usb Qube Settings → Devices tab except for one USB controller and then try to start sys-usb with each USB controller separately to try and find the one that is causing the display issue.
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