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[Mark <1431278@xxxxxxxxxxxxxxxxxx>]

I applied the patch shown on the devtalk.nvidia.com thread and that does
fix the problem; I'm using the Nvidia binary driver with kernel 4.0rc3
now.

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https://bugs.launchpad.net/bugs/1431278

Title:
  nvidia-304-updates 304.125-0ubuntu0.1: nvidia-304-updates kernel
  module failed to build [error: implicit declaration of function
  ‘read_cr4’]

Status in nvidia-graphics-drivers-304-updates package in Ubuntu:
  New

Bug description:
  The nvidia-304-updates kernel module fails to build when installing
  the 4.0rc3 kernel from kernel-ppa.

  A solution/fix for the problem is shown at
  https://devtalk.nvidia.com/default/topic/813458/linux/linux-4-0-rc1-346-47-build-error-_cr4-functions-fix/post/4471335/#4471335

  ProblemType: Package
  DistroRelease: Ubuntu 14.10
  Package: nvidia-304-updates 304.125-0ubuntu0.1 [modified: usr/src/nvidia-304-updates-304.125/nv.c]
  Uname: Linux 3.18.7-031807-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  DKMSKernelVersion: 4.0.0-040000rc3-generic
  Date: Thu Mar 12 10:44:31 2015
  DuplicateSignature: dkms:nvidia-304-updates:304.125-0ubuntu0.1:/var/lib/dkms/nvidia-304-updates/304.125/build/nv-pat.c:38:5: error: implicit declaration of function ‘read_cr4’ [-Werror=implicit-function-declaration]
  InstallationDate: Installed on 2014-12-04 (97 days ago)
  InstallationMedia: Lubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  PackageVersion: 304.125-0ubuntu0.1
  SourcePackage: nvidia-graphics-drivers-304-updates
  Title: nvidia-304-updates 304.125-0ubuntu0.1: nvidia-304-updates kernel module failed to build
  UpgradeStatus: No upgrade log present (probably fresh install)

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