Below image speaks for itself.
Linux Mint 17.3
Kernel: 4.4.0-57 / same issue on 4.8.x and 4.9.x
Laptop: Thinkpad T460 (i5 6300u, 16GB DDR3 RAM, Intel HD Graphics 520)
CSGO is buttery smooth and perfect if I boot with Windows 10 (Windows To Go on external HD). About 20fps less if I boot with the above config, and as you can see I get a strange issue with the colours. Got a urine coloured tint all over the screen.
Please, any suggestions are welcome as this is highly frustrating.
Relax: i don't wanna live forever ringtone, jallikattu ringtones, music ringtones . Good fun!