For months, my Lenovo Yoga C940 laptop seemed to be playing tricks on me.
One minute the display would be pleasantly bright, but switching to anything with a dark background caused a gradual drop in contrast, giving the screen an almost grimy appearance. I could even see the change kick in while switching between applications, as if some auto-brightness setting were constantly going awry, yet the Windows Settings menu offered no obvious solutions.
Eventually, though, I found the source of the problem. Tucked away in recent Intel-powered Windows laptops is a program called Intel Graphics Command Center, containing a sprawling array of virtual knobs and dials for adjusting the look of your laptop’s screen. After making some small adjustments within this program, my laptop’s brightness issues were gone.