[nitrogen]

The worst color change I recall seeing on a laptop was the background color Google used to use to identify ads (a pale yellow as I recall). On cheaper laptop screens even the slightest tilt would make it white, making the ads indistinguishable from real results.

If you have something like the Nvidia Linux control panel for adjusting colors, lowering the white level and raising the black level can help compensate a bit. The open source Media Player Classic (or MPC-HC maybe) player also has a nice shader to correct for the vertical variation, but I don't know of any way to apply it to the whole OS.