I have a ATI Radeon HD 4850 and i can't make it work with a LG 21:9 monitor. Native resolution is 2560x1080 and i can set it. But the image is very poor (text is almost unreadeble). If i set the resolution to 1920x1080 it kind of works, the text is readeble, but the i look like a 360p quality.
I have installed the latest AMD drivers.
The graphic card have 2 dvi ports. I am using a dual-link dvi-d/hdmi to connect the monitor.