I don't have any solutions but I feel your pain. I bought a Dell XPS 15 with the Targus 3.0 dock. Dock works fine (mostly) except connecting external monitors. When I enable them the laptop screen flashes (strobes) continuously, and nothing ever displays on the external monitor.
I've spent DAYS on the phone/email with Targus, Dell, and Intel. I've uninstalled/reinstalled all drivers countless times. At least the XPS reboots pretty quick. The latest rumor is that the DisplayLink driver and the NVIDIA driver aren't playing well together.
I realize Windows 8 is new, but the combo of Dell XPS + Windows 8 + Targus 3.0 dock == JUNK!
I'm seriously considering returning the XPS and dock and going with a MacBook Pro, luckily I'm still within the return window.
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