I have installed Raspbian 12 on my Le Potato but I can’t set the resolution to 2560x1080. It shows the largest available as 1920x1080. This used to work “out of the box” on Raspbian 11.
I had a poke at calculating and adding a new modeline using xrandr but when I try to switch to the new resolution it says “Screen cannot be larger than 1920x1920”
Mali-450 supports textures up to 1920x1920. We capped the resolution to that maximum to prevent applications from trying to render textures greater than the 3D block limit to prevent graphical glitches. If you would like, we can provide a parallel-managed kernel without that resolution cap.