@Rohr7
the same here.
I cant even switch it to dedicated mode . when I switch it via osd ( uefi checked, gpt checked, disable fast reboot and secure boot) , after reboot it turned in black screen with no beep no back-light. I can only get 8900 score in fire strike with optimus mode.
I'm wondering if I can install the driver without osd and I'm a nood dont really understand the procedure like -> reboot -> F8 -> select 'Disable Driver Signature Enforcement' -> Install drivers and then run ddu clean it?
please forgive me and help..