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The Lenovo Thinkpad I have at the office has a DisplayPort output. Not DVI, HDMI, not mini-DisplayPort. Nothing in the office has a DisplayPort input: the monitors take DVI, the big screen takes HDMI, and all the Mac guys have their little white dongles for mini-whatever-mac-people-use.

(Yes, there are other DisplayPort-to-DVI questions, but they seem centered on hooking up 3rd output from a single video card. I'm just trying to get one digital video signal out of my laptop.)

Monoprice sells several DisplayPort-to-DVI cables and adapters that look mechanically correct, but they come with this scary-sounding warning:

This is a passive adapter. While DisplayPort connectors are capable of passing a DVI signal, DisplayPort and DVI signals are basically different and not compatible with each other. This adapter does not actively convert a DisplayPort signal into a DVI signal. In order for this adapter to function properly, you must have a DisplayPort source device capable of producing and passing out a DVI signal through the DisplayPort jack.

How do I know if my Thinkpad is something that's "capable of producing and passing out a DVI signal through the DisplayPort jack"?

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On my T410s, I have a Displayport to HDMI adapter that works. When I bought it, the guy that sold it had a similar warning but the price was so low that I bought it anyway. For the DVI, check this article on the Lenovo forum, display to dvi

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