Backlit problem in dell inspiron 15r se 7520

[rak_aga]

My keyboard backlit in dell inspiron 15r se 7520 is not workiing ...please suggest me something..

 

[ur6beersaway]

It says try to adjust the brightness or contact dell. http/downloads-us.dell.com/Pages/Manuals/inspiron-15r-se-7520.html

 

[rak_aga]

It says try to adjust the brightness or contact dell. http/downloads-us.dell.com/Pages/Manuals/inspiron-15r-se-7520.html

how do i adjust the brightness?