LCD Display contrast/gamma adjustment

[slimSHA]

We have a 7 inch LCD display connected to our SOC (IMX6) and a QTE-based application is running on it (No X Window system). 

Everything is fine but the LCD contrast is not that good. The colors need to be a little darker. 

we have tried adjusting gamma using MXCFB_SET_GAMMA ioctl (the source code is attached) and were able to see some changes in the color. but the colors are distorted. 

How to properly adjust the gamma/contrast of an LCD screen? 

any help is appreciated. 

Thanks in advance.

[igorpadykov · Accepted solution]

Hi Thejas

may be useful to look at unit test examples

https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_fb_test?h=lf-5.10.52_2.1.0

Best regards
igor