I got my new LG ea93 monitor with a native resolution of 2560x1080 (21:9), but in the windows screen resolution setup and in the catalyst control center the highest reolution available is 1920x1080. I have a HD7870 graphics card, which is supposed to support 2560x1600 with DVI. I tried changing the available resolutions of the graphics card in the registry, as shown in this article: http://www.ehow.com/how_7649449_add-custom-resolution-ati.html but it didn't work. Then I found the tool AMD Downsampling GUI and managed to add my resolution. Now the correct reolution shows up in CCC and in Windows Screen resolution setup, but my monitor only displays 1920x1080 and cuts off the right part of the screen.
Is there any other possibility to use a custom resolution with AMD graphic cards?