I just installed the new Lollipop firmware and it works fine, but I still cannot access resolutions higher than 1080p, even though my monitor supports them (HDMI 2.0 compatible with 2560x1440@144Hz). Could you please look into this?
1080p is the highest the kernel supports.
Only video playback will run at a higher resolution.
You could always change the DPI in the /system/build.prop file to more than 240 to make the icons appear smaller.