nixpkgs/pkgs/desktops/kde-4.5/base-workspace/no-software-compositing.patch

diff -ru -x '*~' kdebase-workspace-4.5.5-orig//kwin/compositingprefs.cpp kdebase-workspace-4.5.5/kwin/compositingprefs.cpp
--- kdebase-workspace-4.5.5-orig//kwin/compositingprefs.cpp	2010-06-24 18:28:18.000000000 +0200
+++ kdebase-workspace-4.5.5/kwin/compositingprefs.cpp	2011-03-11 16:33:07.296566718 +0100
@@ -314,9 +314,10 @@
     //else if( mDriver == "radeon" )
     //    {
     //    }
-    //else if( mDriver == "software" )
-    //    {
-    //    }
+    else if( mDriver == "software" )
+        {
+        mRecommendCompositing = false;
+        }
     }