diff -Naur ubuntu-drivers-common-0.2.91.7-orig/share/hybrid/gpu-manager.c ubuntu-drivers-common-0.2.91.7-fixed/share/hybrid/gpu-manager.c
--- ubuntu-drivers-common-0.2.91.7-orig/share/hybrid/gpu-manager.c	2014-09-01 19:50:36.000000000 +0200
+++ ubuntu-drivers-common-0.2.91.7-fixed/share/hybrid/gpu-manager.c	2014-10-16 22:12:21.043646283 +0200
@@ -549,7 +549,7 @@
     else {
         fprintf(stderr, "%s is not a file\n", modprobe_d_path);
         snprintf(command, sizeof(command),
-                 "grep -G \"blacklist.*%s[[:space:]]*$\" %s/*",
+                 "grep -G \"^blacklist.*%s[[:space:]]*$\" %s/*.conf",
                  module, modprobe_d_path);
 
         match = get_output(command, NULL, NULL);