I’ve installed Void Linux base image and my backspace key is broken when I am root, it types ‘^H’ instead of erasing. Function keys also type something weird, but at least the brighness-related ones do work.
This only applies to the root shell, it all works perfectly when I login as a normal user. Probably a bashrc issue?
UPD: I typed ‘stty erase ^H’ in the shell and it now works.
Sure, but there are many ways to do it, depending on all sorts of details/variables, like what terminal or terminal emulator you are using, what shell, etc.
Consistent BackSpace and Delete Configuration has lots of information that might help you understand the relevant details of your system and options for setting it as you wish for root.