According to MXM 2.1 specification, there is the only one instance of the WMI GUID F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0 and so it is instance 0x0. MXM 2.1 specification: https://lekensteyn.nl/files/docs/mxm-2.1-software-spec.pdf _WDG dump: // Methods GUID {F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0} 0x3C, 0x5C, 0xCB, 0xF6, 0xAE, 0x9C, 0xBD, 0x4E, 0xB5, 0x77, 0x93, 0x1E, 0xA3, 0x2A, 0x2C, 0xC0, 0x4D, 0x58, // Object ID "MX" = method "WMMX" 1, // Instance Count 0x02, // Flags (WMIACPI_REGFLAG_METHOD) Signed-off-by: Pali Rohár <pali.rohar@xxxxxxxxx> --- drivers/platform/x86/mxm-wmi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/platform/x86/mxm-wmi.c b/drivers/platform/x86/mxm-wmi.c index f4bad83..35d8b9a 100644 --- a/drivers/platform/x86/mxm-wmi.c +++ b/drivers/platform/x86/mxm-wmi.c @@ -53,7 +53,7 @@ int mxm_wmi_call_mxds(int adapter) printk("calling mux switch %d\n", adapter); - status = wmi_evaluate_method(MXM_WMMX_GUID, 0x1, adapter, &input, + status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input, &output); if (ACPI_FAILURE(status)) @@ -78,7 +78,7 @@ int mxm_wmi_call_mxmx(int adapter) printk("calling mux switch %d\n", adapter); - status = wmi_evaluate_method(MXM_WMMX_GUID, 0x1, adapter, &input, + status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input, &output); if (ACPI_FAILURE(status)) -- 1.7.9.5
