Today I bought a Y560. After setting up the windows I found the screen is dim which hurt my eyes.
I was trying to find solution online. I did the following,
open the lenovo energy management (via the battery touch sensitive button) then click on the gear icon between "i" and "?" and click on smart control tab and uncheck ALS (Ambient Light Sensor)
the settings for brightness settings for battery and A/C plugged in can be changed here (Lenovo Energy Management) for each power scheme (click on the power scheme then click on the gear on the right) and you can change the settings in there.
And I also changed the battery to "high performance"
But nothing worked. I even figure out that the brightness of my screen will not change whatever my setting in energy management is. The screen have same brightness under brightness setting from one to ten.(I sure I hit the apply and ok)