Black Screen to Low Brightness Fn+F1

[musafirrlail]

Hello .. I want ask about a some problem with my laptop, So for introduction I think tell my spec is important, As below here :

HP Pavilion DM3
RAM 8GiB
HDD 500GiB
VGA Onboard by Laptop
Others like Normal

So I am has been install Kali Linux as belo here :

Screenshot from 2015-05-07 11:45:45.jpg


I face time I tried lower brightness and so instant my desktop to be black screen and I tried type some combination keyboard not yet but after I am wait a few second and repeat again with type some Fn+F8 or Fn+F10 suddenly my desktop back to turn on, I dont know problem with my laptop, May any expert / advanced can share about this problem, Thank

Note : I new install and there's nothing change except add repository in /etc/apt/sources.list

[makagucci]

is your laptop plugged in when this happens or running on battery power?

[musafirrlail]

Same problem when I use battery or adaptor .. May any solution ?