I have a VantPC, a Spanish linux computer, that came with ubuntu pre-installed, out of the box the control of the backlights worked perfectly with the buttons on the keyboard.
I had a lot of glitches with the motherboard and ACPI so I switched to Fedora, zero glitches, however, I lost control of the keyboard backlight.
It now switch colors during boot from green (VantPC color) to blue (fedora color) without you being able to change it after starting up, turn it off or control the brightness is totally imposible. Always blue. Unless the computer hibernates, in which case, when it returns to life, they are turned off until the next power-on.
What can I do?