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I was able to change the resolution to 1920x1080 by changing parameters in /etc/default/grub. But if I set the resolution to 2160x1440 (the resolution of Surface Pro 3), it does not accept this setting. I am reading everywhere that 1920x1080 is max resolution, but I don't understand why. There must be a way how to increase max resolution. Can anyone help?

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I have the same problem with you, I google several hours but find no answer. Finally, I got a solution and it works well for me. You can install xrdp on the ubuntu(guest OS in Hyper V), and then connect ubuntu by mstsc. Now it works in 2160x1440. –  Zhou Sep 12 at 15:07

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