Bug#731265:

[Beren Minor]

Alright, I thought that conftest.h was part of the upstream NVidia driver
package, and as I was comparing with a working Ubuntu driver (331.38) to
figure out what was missing, I thought that this had changed between 331.38
and 340.32.

I see now that this is Debian-only, and was probably never activated, as
you mentioned. It explains why Nils Goroll had troubles with driver
versions 331.38 and 319.76 as well.

I attached the debdiff you requested.
--
Beren Minor
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diff -Nru nvidia-graphics-drivers-340.32/debian/changelog nvidia-graphics-drivers-340.32/debian/changelog
--- nvidia-graphics-drivers-340.32/debian/changelog	2014-08-17 12:20:45.000000000 +0200
+++ nvidia-graphics-drivers-340.32/debian/changelog	2014-09-01 08:37:11.000000000 +0200
@@ -1,3 +1,10 @@
+nvidia-graphics-drivers (340.32-2) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix DRM support activation in conftest.h (Closes #731265)
+
+ -- Beren Minor <beren.minor+debian at gmail.com>  Mon, 01 Sep 2014 08:35:48 +0200
+
 nvidia-graphics-drivers (340.32-1) unstable; urgency=medium
 
   * New upstream long lived branch release 340.32 (2014-08-12).
diff -Nru nvidia-graphics-drivers-340.32/debian/module/conftest.h nvidia-graphics-drivers-340.32/debian/module/conftest.h
--- nvidia-graphics-drivers-340.32/debian/module/conftest.h	2014-08-17 12:20:45.000000000 +0200
+++ nvidia-graphics-drivers-340.32/debian/module/conftest.h	2014-09-01 08:24:55.000000000 +0200
@@ -374,7 +374,7 @@
 #endif
 
 /* Implement conftest.sh function drm_available */
-#if 0
+#if IS_ENABLED(CONFIG_DRM) || IS_ENABLED(CONFIG_DRM_MODULE)
  #define NV_DRM_AVAILABLE
 #else
  #undef NV_DRM_AVAILABLE