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I just got my Tobii EyeX device and have two test laptops…it worked straight away on one and wont on the other.

It’s not being recognised on my Dell E7440 but got picked up immediately by my Vaio svf15aa1qm…both are i5 8GB laptops running Windows 8.1.

The only real difference I can see in the device driver settings is that if you check the “Universal Serial Bus controllers” node in Device Manager, my Dell is running an Intel(R) 8 Series/ chipset USB Enhanced Host Controller, while the Sony Vaio is running an Intel(R) 7 Series/C216 chipset USB Enhanced Host Controller.

I only got my Tobii device today so have not done too much tweaks on device driver versions but my drivers are pretty much up to date (Aug 2014) but will keep digging around.