Public bug reported:

I'm using a Lenovo Thinkpad W540 containing an internal intel and a
nvidia graphics card.

lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor 
Integrated Graphics Controller (rev 06)
01:00.0 VGA compatible controller: NVIDIA Corporation GK106GLM [Quadro K2100M] 
(rev a1)

The Nouveau driver works (without 3d acceleration), but as soon as i
switch to the proprietary nvidia-331 driver, the system gets stuck at
the load screen and the login screen never shows up. Only option at this
point is to switch to the console and remove the nvidia driver via sudo
apt-get --purge remove nvidia-331

/var/log/Xorg.0.log shows two errors with the nvidia driver in place

[    10.075] (EE) [drm] KMS not enabled
[    10.087] (EE) Failed to initialize GLX extension (Compatible NVIDIA X 
driver not found)

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-20.42-generic 3.13.7
Uname: Linux 3.13.0-20-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  331.38  Wed Jan  8 19:32:30 
PST 2014
 GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-17ubuntu2)
ApportVersion: 2.14-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
Date: Tue Apr  1 10:34:09 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.7, 3.13.0-20-generic, x86_64: installed
 nvidia-331, 331.38, 3.13.0-20-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation 4th Gen Core Processor Integrated Graphics Controller 
[8086:0416] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:2211]
 NVIDIA Corporation GK106GLM [Quadro K2100M] [10de:11fc] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: Lenovo Device [17aa:2211]
InstallationDate: Installed on 2014-03-25 (6 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
MachineType: LENOVO 20BG001SGE
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-20-generic 
root=UUID=e943bd1a-4044-41be-9a84-34de2b2a6485 ro 
thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor quiet splash
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/18/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: GNET61WW (2.09 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BG001SGE
dmi.board.vendor: LENOVO
dmi.board.version: 0B98401 Pro
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvrGNET61WW(2.09):bd02/18/2014:svnLENOVO:pn20BG001SGE:pvrThinkPadW540:rvnLENOVO:rn20BG001SGE:rvr0B98401Pro:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20BG001SGE
dmi.product.version: ThinkPad W540
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-1ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Tue Apr  1 10:33:42 2014
xserver.configfile: default
xserver.errors:
 [drm] KMS not enabled
 Failed to initialize GLX extension (Compatible NVIDIA X driver not found)
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.15.0-1ubuntu7

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty ubuntu

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https://bugs.launchpad.net/bugs/1300669

Title:
  X Server fails to start with nvidia-331 in 14.04

Status in “xorg” package in Ubuntu:
  New

Bug description:
  I'm using a Lenovo Thinkpad W540 containing an internal intel and a
  nvidia graphics card.

  lspci | grep VGA
  00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor 
Integrated Graphics Controller (rev 06)
  01:00.0 VGA compatible controller: NVIDIA Corporation GK106GLM [Quadro 
K2100M] (rev a1)

  The Nouveau driver works (without 3d acceleration), but as soon as i
  switch to the proprietary nvidia-331 driver, the system gets stuck at
  the load screen and the login screen never shows up. Only option at
  this point is to switch to the console and remove the nvidia driver
  via sudo apt-get --purge remove nvidia-331

  /var/log/Xorg.0.log shows two errors with the nvidia driver in place

  [    10.075] (EE) [drm] KMS not enabled
  [    10.087] (EE) Failed to initialize GLX extension (Compatible NVIDIA X 
driver not found)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-20.42-generic 3.13.7
  Uname: Linux 3.13.0-20-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  331.38  Wed Jan  8 19:32:30 
PST 2014
   GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-17ubuntu2)
  ApportVersion: 2.14-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  Date: Tue Apr  1 10:34:09 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 3.13.0-20-generic, x86_64: installed
   nvidia-331, 331.38, 3.13.0-20-generic, x86_64: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller 
[8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:2211]
   NVIDIA Corporation GK106GLM [Quadro K2100M] [10de:11fc] (rev a1) (prog-if 00 
[VGA controller])
     Subsystem: Lenovo Device [17aa:2211]
  InstallationDate: Installed on 2014-03-25 (6 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
  MachineType: LENOVO 20BG001SGE
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-20-generic 
root=UUID=e943bd1a-4044-41be-9a84-34de2b2a6485 ro 
thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor quiet splash
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/18/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GNET61WW (2.09 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BG001SGE
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98401 Pro
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrGNET61WW(2.09):bd02/18/2014:svnLENOVO:pn20BG001SGE:pvrThinkPadW540:rvnLENOVO:rn20BG001SGE:rvr0B98401Pro:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20BG001SGE
  dmi.product.version: ThinkPad W540
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-1ubuntu1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.10-1ubuntu2
  xserver.bootTime: Tue Apr  1 10:33:42 2014
  xserver.configfile: default
  xserver.errors:
   [drm] KMS not enabled
   Failed to initialize GLX extension (Compatible NVIDIA X driver not found)
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.15.0-1ubuntu7

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