Brightness control in imx61 apalis

I am trying to control the LVDS display brightness in imx6q apalis, In user space i am able to see the brightness values change but on display its not changing the brightness control, below is the driver code and dtsi file for brightness control, Can any one help to resolve this issue little bit urgent task,
one can look for this link is same

Thanks in advance

sorry not imx61 it is imx6q apalis

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LVDS Display brightness control imx6q apalis - Technical Support - Toradex Community