I really really need your help because my attempts in the last few days were unsuccessful and I don't know what else to do. I am the owner of an old ATI Radeon HD 4650 with Linux Mint 18.3 Cinnamon and 4 gb RAM memory. I bought Lg 29um58-P ultrawide monitor. I am also using dual link dvi to hdmi adapter to connect monitor.
The problem is that, when I change the resolution to 2560x1080px, it applies that resolution but it looks like it keeps 16:9 aspect ratio(very strange), image is blurred with big black borders on on the left and right side. I tried everything but I was unsuccessful in attempt to tell my gpu to show 21:9 aspect ratio. I really don't know what to do. I tried to uninstall Linux and install Windows 10, the same thing happened.
Does anyone have an idea what to do? I really hope someone will help me.
Sorry for my bad english and have a nice day