On AC, you can move the slider but the screen just stays dark. Just installed it on my GF's Sony S and it has the same problem, both are core i5 with intel gfx i wonder if its the intel gfx...?
I have the same problem on my sony Z. It says its at 100% brightness however moving the slider makes no differance and the screen is so dim you can hardly use it! Sucks as means i cant use the OS.
Anyone else got a Sony that has worked out how to get around this?
