drm/mxm: fix Kconfig options for when to build MXM WMI driver.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/Kconfig b/drivers/gpu/drm/nouveau/Kconfig
index e2f8a38..e83c5b1 100644
--- a/drivers/gpu/drm/nouveau/Kconfig
+++ b/drivers/gpu/drm/nouveau/Kconfig
@@ -11,7 +11,7 @@
 	select FRAMEBUFFER_CONSOLE if !EXPERT
 	select FB_BACKLIGHT if DRM_NOUVEAU_BACKLIGHT
 	select ACPI_VIDEO if ACPI && X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL && INPUT
-	select MXM_WMI if ACPI
+	select MXM_WMI if ACPI && ACPI_WMI
 	help
 	  Choose this option for open-source nVidia support.
 
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 9491457..006c6d5 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -755,7 +755,7 @@
 
 config MXM_WMI
        tristate "WMI support for MXM Laptop Graphics"
-       depends on WMI
+       depends on ACPI_WMI
        ---help---
           MXM is a standard for laptop graphics cards, the WMI interface
 	  is required for switchable nvidia graphics machines