For some reason my fedora is turning the keyboard back light off. Even if I press the keyboard shorcut to turn the light on, it doesn't work. For a long time I thought that the reason is hardware problem, until I found this
post and it turns out to be software issue.
Here is the script that I used on my machine to restore the keyboard light. Execute following command line several times until it outputs "100" (percents)
kb-light.py +
or
kb-light.py --up
The python script:
#!/usr/bin/env python3
# coding: utf-8
from sys import argv
import dbus
def kb_light_set(delta):
bus = dbus.SystemBus()
kbd_backlight_proxy = bus.get_object('org.freedesktop.UPower', '/org/freedesktop/UPower/KbdBacklight')
kbd_backlight = dbus.Interface(kbd_backlight_proxy, 'org.freedesktop.UPower.KbdBacklight')
current = kbd_backlight.GetBrightness()
maximum = kbd_backlight.GetMaxBrightness()
new = max(0, current + delta)
if new >= 0 and new <= maximum:
current = new
kbd_backlight.SetBrightness(current)
# Return current backlight level percentage
return 100 * current / maximum
if __name__ == '__main__':
if len(argv[1:]) == 1:
if argv[1] == "--up" or argv[1] == "+":
# ./kb-light.py (+|--up) to increment
print(kb_light_set(1))
elif argv[1] == "--down" or argv[1] == "-":
# ./kb-light.py (-|--down) to decrement
print(kb_light_set(-1))
else:
print("Unknown argument:", argv[1])
else:
print("Script takes exactly one argument.", len(argv[1:]), "arguments provided.")
