HTC announced that its Vive Ultimate Tracker is now compatible with third-party PC VR headsets that support SteamVR.
Originally developed for the Vive Focus 3 and Vive XR Elite, Vive Ultimate Tracker is a puck-like device that comes equipped with two cameras, allowing it to track its position without external devices or base stations, supporting both object and full-body tracking.
Released last November for $200, Vive Ultimate Tracker is now compatible with SteamVR headsets, which includes tethered PC VR headsets such as Valve Index, but also standalone devices capable of connecting to PCs, such as Quest 3 or Pico Pico 4 Ultra
it's probably because I'm on linux and the nvidia drivers aren't working as they should. steamVR opens and registers the hardware turned on but nothing connects.