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[EvilSupahFly <1456445@xxxxxxxxxxxxxxxxxx>]

I reverted to kernel 3.17 and all my AMD troubles went away. Stability
for me is more important than running the hottest new kernel.

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https://bugs.launchpad.net/bugs/1456445

Title:
  fglrx-core 2:15.200-0ubuntu4: fglrx-core kernel module failed to build
  [error: implicit declaration of function ‘read_cr4’]

Status in fglrx-installer package in Ubuntu:
  Confirmed

Bug description:
  DKMS make.log for fglrx-core-15.200 for kernel 4.0.4-040004-generic (x86_64)
  Tue May 19 00:32:40 EDT 2015
  /usr/sbin/dkms: line 74: cd: /var/lib/dkms/fglrx/15.200/build: No such file or directory
  AMD kernel module generator version 2.1
  doing Makefile based build for kernel 2.6.x and higher
  rm -rf *.c *.h *.o *.ko *.a .??* *.symvers
  make -C /lib/modules/4.0.4-040004-generic/build SUBDIRS=/var/lib/dkms/fglrx-core/15.200/build/2.6.x modules
  make[1]: Entering directory '/usr/src/linux-headers-4.0.4-040004-generic'
    CC [M]  /var/lib/dkms/fglrx-core/15.200/build/2.6.x/firegl_public.o
  /var/lib/dkms/fglrx-core/15.200/build/2.6.x/firegl_public.c: In function ‘kcl_mem_pat_setup’:
  /var/lib/dkms/fglrx-core/15.200/build/2.6.x/firegl_public.c:4499:9: error: implicit declaration of function ‘read_cr4’ [-Werror=implicit-function-declaration]
           cr4 = read_cr4();
           ^
  /var/lib/dkms/fglrx-core/15.200/build/2.6.x/firegl_public.c:4500:9: error: implicit declaration of function ‘write_cr4’ [-Werror=implicit-function-declaration]
           write_cr4(cr4 & ~X86_CR4_PGE);
           ^
  /var/lib/dkms/fglrx-core/15.200/build/2.6.x/firegl_public.c: At top level:
  /var/lib/dkms/fglrx-core/15.200/build/2.6.x/firegl_public.c:6424:12: warning: ‘KCL_fpu_save_init’ defined but not used [-Wunused-function]
   static int KCL_fpu_save_init(struct task_struct *tsk)
              ^
  cc1: some warnings being treated as errors
  scripts/Makefile.build:258: recipe for target '/var/lib/dkms/fglrx-core/15.200/build/2.6.x/firegl_public.o' failed
  make[2]: *** [/var/lib/dkms/fglrx-core/15.200/build/2.6.x/firegl_public.o] Error 1
  Makefile:1390: recipe for target '_module_/var/lib/dkms/fglrx-core/15.200/build/2.6.x' failed
  make[1]: *** [_module_/var/lib/dkms/fglrx-core/15.200/build/2.6.x] Error 2
  make[1]: Leaving directory '/usr/src/linux-headers-4.0.4-040004-generic'
  Makefile:88: recipe for target 'kmod_build' failed
  make: *** [kmod_build] Error 2
  build failed with return value 2

  ProblemType: Package
  DistroRelease: Ubuntu 15.04
  Package: fglrx-core 2:15.200-0ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  DKMSKernelVersion: 4.0.4-040004-generic
  Date: Tue May 19 00:32:43 2015
  DuplicateSignature: dkms:fglrx-core:2:15.200-0ubuntu4:/var/lib/dkms/fglrx-core/15.200/build/2.6.x/firegl_public.c:4499:9: error: implicit declaration of function ‘read_cr4’ [-Werror=implicit-function-declaration]
  InstallationDate: Installed on 2015-05-01 (17 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  PackageVersion: 2:15.200-0ubuntu4
  RelatedPackageVersions:
   dpkg 1.17.25ubuntu1
   apt  1.0.9.7ubuntu4
  SourcePackage: fglrx-installer
  SystemImageInfo:
   current build number: 0
   device name: ?
   channel: daily
   last update: Unknown
  Title: fglrx-core 2:15.200-0ubuntu4: fglrx-core kernel module failed to build
  UpgradeStatus: No upgrade log present (probably fresh install)

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