[quote] ....
Will this do: http://www.cableuniverse.co.uk/catalog/cables/Display-Port-male-to-VGA-female-adapter.html
how does this work if it's not powered by usb?
It has to be getting it's power through the DP connection.
The reason it works, I think but don't quote me, is because by having to convert the digital output to analog VGA input, there is an "active" process taking place, not just a "passive" pass-through of digital to digital.
All I know is that it works!!
So, even though I can't say for sure that the one you found will work, it seems to me that ANY displayport to analog VGA adapter will have this "active" process taking place.
Good luck!!
For UK peops check out this ebay dude, just £12 shipped from HK
http://cgi.ebay.co.uk/Display-Port-to-VGA-Adapter-converter_W0QQitemZ330379051140QQcmdZViewItemQQptZUK_Computing_CablesConnectors_RL?hash=item4cec204084