As I was searching again for this (I once knew it, but I keep forgetting it), I will simply write it down here: if you want to see all the unattached devices in the device manager, you have to set the environment variable devmgr_show_nonpresent_devices to value 1. If you then start the device manager, you have to also check “Show hidden devices“.
This is documented in Microsoft KB315539.
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