Public bug reported:

Using trusty amd64 with nvidia-331-updates_331.20-0ubuntu8.

linux-image-3.12.0-7-generic:
[    33.986] (--) NVIDIA(0): Valid display device(s) on GeForce 310M at 
PCI:1:0:0
[    33.987] (--) NVIDIA(0):     CRT-0
[    33.987] (--) NVIDIA(0):     Sony Nvidia Defaul (DFP-0) (boot, connected)
[    33.987] (--) NVIDIA(0):     DFP-1
[    33.987] (--) NVIDIA(0):     DFP-2

linux-image-3.13.0-1-generic:
[    25.755] (--) NVIDIA(0): Valid display device(s) on GeForce 310M at 
PCI:1:0:0
[    25.755] (--) NVIDIA(0):     CRT-0
[    25.755] (--) NVIDIA(0):     DFP-0 (boot)
[    25.755] (--) NVIDIA(0):     DFP-1
[    25.755] (--) NVIDIA(0):     DFP-2
[    25.755] (--) NVIDIA(0): CRT-0: 400.0 MHz maximum pixel clock
[    25.755] (--) NVIDIA(0): DFP-0: Internal Single Link TMDS
[    25.755] (--) NVIDIA(0): DFP-0: 330.0 MHz maximum pixel clock
[    25.755] (--) NVIDIA(0): DFP-1: Internal Single Link TMDS
[    25.755] (--) NVIDIA(0): DFP-1: 165.0 MHz maximum pixel clock
[    25.755] (--) NVIDIA(0): DFP-2: Internal Single Link TMDS
[    25.755] (--) NVIDIA(0): DFP-2: 165.0 MHz maximum pixel clock
[    25.755] (EE) NVIDIA(0): Failed to assign any connected display devices to 
X screen 0.

The problem persists in the mainline 3.13-rc7.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-1-generic 3.13.0-1.16
ProcVersionSignature: Ubuntu 3.13.0-1.16-generic 3.13.0-rc7
Uname: Linux 3.13.0-1-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.12.7-0ubuntu6
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  shiba      2314 F.... pulseaudio
 /dev/snd/controlC0:  shiba      2314 F.... pulseaudio
Date: Thu Jan  9 12:13:21 2014
HibernationDevice: RESUME=UUID=139076d6-04be-4ca0-b2fa-e57b8bb17739
InstallationDate: Installed on 2014-01-03 (5 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140103)
MachineType: Sony Corporation VPCS11E7E
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-1-generic 
root=UUID=c00738bd-0907-4a6b-b361-7777b8878455 ro quiet splash 
video=uvesafb:mode_option=1360x768-24,mtrr=3,scroll=ywrap
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-1-generic N/A
 linux-backports-modules-3.13.0-1-generic  N/A
 linux-firmware                            1.119
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/30/2010
dmi.bios.vendor: INSYDE
dmi.bios.version: R0310Q3
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnINSYDE:bvrR0310Q3:bd09/30/2010:svnSonyCorporation:pnVPCS11E7E:pvrC103ZTX7:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VPCS11E7E
dmi.product.version: C103ZTX7
dmi.sys.vendor: Sony Corporation

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


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1267437

Title:
  X cannot detect laptop monitor with Linux 3.13.0-1-generic and Nvidia
  331

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