intel_backlight not included in available kernal interfaces list in gsd-backlight-helper.c
Recently installed Fedora on my laptop and was unable to change the screen backlight through the system menu slider. After searching for a while, a workaround found was to install xbacklight and change the backlight through the terminal. xbacklight works now but the slider still doesn't.
Searched further and found this bug report : https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=651741 ,which says adding intel_backlight to backlight_interfaces[]
(https://gitlab.gnome.org/GNOME/gnome-settings-daemon/blob/64f2267ae0752a71db8af1010cc1a989f6fa36f0/plugins/power/gsd-backlight-helper.c) might solve the problem.