I have an Acer Aspire 3 with Vega 8 graphics integrated and Radeon 540x series dedicated. I tried everything to switch vega 8 to 540x however it is not working. I tried to change power options, and I also tried to use windows' graphic switch but they don't work. It is nearly 6 months now and i can't play games in a normal way. Anybody please help. Thank you!