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[Impulse <kristal_plus@xxxxxxx>]

DeadMetaler:
sudo leafpad /usr/src/nvidia-340-340.76/nv-pat.c
about 35 line change "read_cr4" to "__read_cr4" and  "write_cr4" to "__write_cr4" or copy-past:
---------------------------------------
static inline void nv_disable_caches(unsigned long *cr4)
{
    unsigned long cr0 = read_cr0();
    write_cr0(((cr0 & (0xdfffffff)) | 0x40000000));
    wbinvd();
    *cr4 = __read_cr4();
    if (*cr4 & 0x80) __write_cr4(*cr4 & ~0x80);
    __flush_tlb();
}

static inline void nv_enable_caches(unsigned long cr4)
{
    unsigned long cr0 = read_cr0();
    wbinvd();
    __flush_tlb();
    write_cr0((cr0 & 0x9fffffff));
    if (cr4 & 0x80) __write_cr4(cr4);
}
---------------------------------------
Then:
sudo dkms autoinstall -k 4.0.0-040000-generic -m nvidia-340 -v 340.76

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-graphics-drivers-304-updates in
Ubuntu.
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:
  Confirmed
Status in nvidia-graphics-drivers-340 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-346-updates package in Ubuntu:
  Confirmed

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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