Neither Brightness keys Fn+upward arrow not working, nor the settings of power management is coming

– My brightness keys, and power management related options not working nor showing –

  • Parrot version, kernal version in use :
    Operating System: Parrot GNU/Linux 4.10
    Kernel: Linux 5.8.0-2parrot1-amd64
    Architecture: x86-64

My brightness keys Fn+Upward, downward arrows are not working. I install kde settings, but there is also problem. It doesn’t show any options.
My brightness key also don’t work.
Control center also don’t have any option to set or change brightness.
With xrandr brightness could be changed but not like system default, as it has more white light and other errors.
How can I fix it?