I had trouble with a late 2010 MacBook Air 13" and a Dell U2210 when using a mini-display port to display port cable. I only tried the native resolution (1920x1080), but it had all sort of problems ...
It seems my new Dell 2405fpw can't seem to run certain resolutions even though Windows says it's running at them. For example, if I try 720p (ie. 1280x720), the 2405fpw doesn't seen to scale to that ...
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