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It's my first question here and I feel really bothered by this problem. I recently bought a new AOC e2343F2k 23" monitor, it supports 1920x1080 resolution and when I plugged by the first time, it worked perfectly.

I made some changes (I do not recall what), and I can no longer get full hd resolution, the best I can get is 1440x900.

I tried to install another different distros in order to check if the source problem is the os, but no success. I don't know what to do. I forced the resolution using xrandr but it also did not work, the screen resolution is expanded beyond the monitor edges and I can't see the right and left side of the desktop and the screen image quality is poor.

Any suggestions ?

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Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information. –  bodhi.zazen Feb 27 '12 at 5:02
    
It's a cable issue eventually (Poor quality miniDP to VGA adapters). You're not the only one having this issue. You need a good quality adapter that preserve didigtal signal quality and properties when converting into analog signal. Generally, if you got a 20 bucks cable, it wouldn't do the job. –  Hanynowsky Apr 8 '12 at 23:34
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According to Hanynowsky, this is a hardware issue, which should be solved by replacing the cable. (If that is correct, then this answers the question and solves the problem.)

It's a cable issue eventually (Poor quality miniDP to VGA adapters). You're not the only one having this issue. You need a good quality adapter that preserve didigtal signal quality and properties when converting into analog signal. Generally, if you got a 20 bucks cable, it wouldn't do the job.

Hanynowsky Apr 8 '12 at 23:34

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