How do I call ACPI control methods on Windows?

[jacobm07]

I'm getting tired of waiting for HP to fix the switchable graphics driver for my laptop, but I think I can switch GPUs myself by calling ACPI methods. The switching works using vga_switcheroo in Linux, which is open source, so I know what methods I need to call, but not how to call them.

The two methods I need to call are in the SSDT namespace, if that matters, and I also need to pass integer arguments.

I found out about the acpi.sys driver, but it seems to be documented very poorly (if at all.)

[Computergeek01]

One of us seems to be very confused. Switching a GPU is handeled by either the driver or the system scheduler, but definitly NOT by the end user or even an application running in user mode. What model laptop do you have? I guarentee that there is a better solution then writing your own driver (which could take years).