After reading dozens of other posts and nothing seems to work, I've located "keyboard backlight" in the
/sys/module/sony_laptop/parameters/ module but don't know how to get it to switch on.
I've downloaded the Sony VAIO control center for Linux here but don't know how to use it to enable the keyboard backlight. Can anyone help with that please?
I feel so close yet so far away. I've been trying to solve this problem for many days and hours so any help would be much appreciated.