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I'm using VS2008, my OS is Win7. I tried WinAPI IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS on my netbook. I can retrive a correct the LCD handle, but DeviceIoControl returns 0. I haven't found any APIs for GMA 3150 either.

Ivan
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small example: http://davidxl.blogspot.com/2010/07/controla-el-nivel-de-backlight-de-una.html

David Gonzalez
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    elaborate answer..and give him the clear what would be the problem..! then give suggestive links.. – Chella Dec 18 '12 at 04:33