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I'm using 3.19.0-26-generic as kernel.

Ubuntu version is:
Description:	Ubuntu 15.04
Release:	15.04

Version of the nouveau driver is:
  Installed: 1:1.0.11-1ubuntu2build1
  Candidate:    1:1.0.11-1ubuntu2build1
  Version table:
 *** 1:1.0.11-1ubuntu2build1 0
        500 http://ftp.acc.umu.se/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status

I expected the module to be able to work without freezing the entire system.
This issue prevents me from getting to the login session.

I have installed Ubuntu on my brand new laptop which is a Asus N550JK.
It has Hybrid Graphics (Intel 4th Generation + nVidia GeForce GTX 850M so I was told to nvidia-prime for Optimus.
Sometimes when I boot the kernel it stops before I see the login window and the computer is completely frozen.

However if I switch to the proprietary driver for nouveau the computer
doesn't lock completely anymore.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
ProcVersionSignature: Ubuntu 3.19.0-26.28-generic 3.19.8-ckt4
Uname: Linux 3.19.0-26-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  346.59  Tue Mar 31 14:10:31 PDT 2015
 GCC version:  gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
ApportVersion: 2.17.2-0ubuntu1.3
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Sep  7 09:19:38 2015
DistUpgraded: Fresh install
DistroCodename: vivid
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.7, 3.19.0-26-generic, x86_64: installed
 nvidia-346, 346.59, 3.19.0-26-generic, x86_64: installed
GraphicsCard:
 Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:11cd]
   Subsystem: ASUSTeK Computer Inc. Device [1043:11cd]
InstallationDate: Installed on 2015-09-05 (1 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: ASUSTeK COMPUTER INC. N550JK
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-26-generic.efi.signed root=UUID=28c2cc37-e8b5-4f1d-8a4a-33f26e77b390 ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-video-nouveau
UdevLog: Error: [Errno 2] Filen eller katalogen finns inte: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/26/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: N550JK.208
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: N550JK
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN550JK.208:bd09/26/2014:svnASUSTeKCOMPUTERINC.:pnN550JK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnN550JK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: N550JK
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2
version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.9-2ubuntu1~vivid2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.9-2ubuntu1~vivid2
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
xserver.bootTime: Mon Sep  7 09:16:28 2015
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 intel(G1): [drm] failed to set drm interface version: Permission denied [13].
 intel(G1): Failed to claim DRM device.
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               16971 
 vendor                                     SDC
xserver.version: 2:1.17.1-0ubuntu3

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Incomplete

** Affects: xserver-xorg-video-nouveau (Mandriva)
     Importance: Critical
         Status: Confirmed


** Tags: amd64 apport-bug latest-bios-208 ubuntu vivid
-- 
Kernel sometimes won't boot to login screen
https://bugs.launchpad.net/bugs/1492934
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