Lenovo Display driver issue

Hi,
     I am using a Lenovo Ideapd 100, 15IBD. Recently my win 10 crashed and I had to install Win 7. Later I found the brightness keys are not functioning and the brightness option is not available in Battery power option as well. I tried many drivers, but everytime I update a driver, the screen display gets distorted like something got exploded kind of. Hence I have to rollback the driver everyhime. Can anyone please help me to resolve this. Also I couldnt find the bluetooth as well?
Any idea?


Please help.

Thanks!

I didn't find the right solution from the Internet.

References:
www.cnet.com/forums/discussions/lenovo-display-driver-issue/


explainer video examples