Manjaro System Settings not asking for root password while installing kernel

I tried installing kernel from the settings manager (systemsettings5) but the operation fails most probably because there is no popup asking for the root password but if I try to save some file in the root directory using sublime the root password dialog comes up. Display brightness is also not functioning but the brightness changes when I change the brightness value in the /sys/class/backlight/amdgpu_bl1/brightness file. Could someone please help me with this?