vid_set_switch_policy
vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_OSPM |
vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_BIOS);
vid_set_switch_policy(sc->handle, DOS_SWITCH_BY_BIOS);
static void vid_set_switch_policy(ACPI_HANDLE, UINT32);