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Can't apply gamma correction to /dev/fb2

Question asked by Mirko Ardinghi on Aug 9, 2017
Latest reply on Aug 28, 2017 by Mirko Ardinghi

I need to change the GAMMA value (with the ioctl MXCFB_SET_GAMMA) to framebuffer /dev/fb2

I developed a simple program with whom I can successfully change the gamma value to /dev/fb0 but when I try with /dev/fb2 I obtain the following error:

 

Ioctl MXCFB_SET_GAMMA fail!

 

I'm using a imx6duallite with linux yocto (krogoth version)

 

Any help?

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