White Background In Landscape Text Input
I assume you have a screen like this one? There's a way to disable the so called "fullscreen landscape keyboard". Some custom roms have feature an option by default, but not CyanogenMod. 

What you could try is to download the Xposed Framework and disable that fullscreen landscape keyboard through Xposed Modules like "Gravity Box" or "XBlast Tools". 

Those two modules also feature a lot of other useful tweaks.

I hope I understood you correctly and that this will be helpful.

EDIT: Those two modules I mentioned above may be a bit confusing at first. So I would rather recommend this module instead: No Fullscreen Keyboard Xposed - Android Apps on Google Play