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I want to use my external monitor's resolution fully (2560x1440) with a USB display adapter for my laptop. I have one with Windows drivers, are there any adapter with linux / Ubuntu drivers that can give me full resolution?

I am thinking of something like my current USB to DisplayPort adapter.

HDMI only gives 1920x1200 (am using arandr to achieve this easily), and my laptop haven't got displayport. But I know that the graphic card can deliver 2560x1440 digitally or through an USB adapter.

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Unfortunately Linux support of these USB display adaptors isn't really available on a usable scale... I have three of these devices and am forced to use them under Windows.

I guess you could run a virtual machine in Windows and do it that way, but that will likely slow your machine down somewhat :-(

I check Google every now and then for updates on this as I'm very keen to see this functionality in Linux, too!

EDIT

Found this link, in case you want to give it a whirl

http://gavinmhackeling.com/blog/2012/12/how-to-use-an-external-displaylink-monitor-with-linux/

HTH

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