The forum

how do you disable the "anti-piracy settings" I keep hearing so much about, because when I try to play it with wine on steam it says "Finishing installation".. then "Installation Failed Portal 2 (2)" or something similar to that noise I keep hearing people having this error but no fixes, so come on and make this right POL and tell us how to fix this madness! >:O

Disabling anti-piracy protection is to prevent game crashing after Main Menu, you have another problem to solve first.

Try activating glsl support, it works for me on ATI. :D