Hi, I'm a Alex's colleague, with the exact same laptop and I have tried several different boot/kernel flags. The once I tried : GraphicsEnabler=Yes/No (both), PCIRootUID=0/1 (both), SkipNvidiaGfx=Yes/No, -x , -v (no resolvable errors) Still only output on external display (I tried every flag without the external display plugged in.)Does anyone know how to use the flags display_0= and display_1= ? Is there a way to figure out wich Hex key to use (or how to retrieve it) for the internal display, or are we forced to edit the DSDT, wich I have never done before, so hints are welcome. I've seen a different post about making a change to the DSDT regarding Nvcap being wrong in de DSDT, I'll try to test this, when I can.... Thanks, Dennis.