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So I was looking at a question about forcing X to recognise video memory to achieve 1080p resolution, however when I finished the following piece of code:

Section "Device"

        Identifier "Screen0"
        VideoRam 1048576

EndSection

I don't know what to do. I tried to exit and save it but it told me "File and location does not exist" or something like that. What do I do? How do I save it? Here is the post I was looking at for answers.

Achieving full resolution with PowerVR SGX454 on Ubuntu 12.04

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