Horrible color banding on certain low-end Lenovo laptops. Fix? Tilt the screen

Example Lenovo Z50-75 with HD display:

https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/Z50-75-...

Completely unusable for anything beyond Excel. I don't see how it is different from selling laptop with B&W display. By their own description it's an "multimedia" notebook. They also have fake product images with proper color gradients :)