Not getting full resolution

Hi guys, I'm not sure if this is the right forum to post in, but hoping someone can help me. I don't have an Apple display, but an Acer G245H. The highest available resolution in the Display preferences panel is 1600 x 900, but underneath the Resolutions list is a note saying "Usable resolution 1366 x 768". Does anyone know what that means? Is there any way to increase the resolution?

<http://www.acer.com/acer/productv.do;jsessionid=6ADAD29B699CCBFB50CC15709375BDB F.publicaus004?LanguageISOCtxParam=en&kcond61e.c2att101=71962&sp=page16e&ctx2.c2att1=27&l ink=ln438e&CountryISOCtxParam=CA&ctx1g.c2att92=479&ctx1.att21k=1&CRC=2909038790>
says it uses a 1920 x 1080 60 Hz display. Have you tried the DVI port?

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