drm: add better explanation for i830/i915

Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/char/drm/Kconfig

@@ -60,7 +60,9 @@ config DRM_I830
 	  Choose this option if you have a system that has Intel 830M, 845G,
 	  852GM, 855GM or 865G integrated graphics.  If M is selected, the
 	  module will be called i830.  AGP support is required for this driver
-	  to work. This driver will eventually be replaced by the i915 one.
+	  to work. This driver is used by the older X releases X.org 6.7 and
+	  XFree86 4.3. If unsure, build this and i915 as modules and the X server
+	  will load the correct one.
 
 config DRM_I915
 	tristate "i915 driver"
@@ -68,8 +70,9 @@ config DRM_I915
 	  Choose this option if you have a system that has Intel 830M, 845G,
 	  852GM, 855GM 865G or 915G integrated graphics.  If M is selected, the
 	  module will be called i915.  AGP support is required for this driver
-	  to work. This driver will eventually replace the I830 driver, when
-	  later release of X start to use the new DDX and DRI.
+	  to work. This driver is used by the Intel driver in X.org 6.8 and
+	  XFree86 4.4 and above. If unsure, build this and i830 as modules and 
+	  the X server will load the correct one.
 	
 endchoice