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OS: Ubuntu Gnome 14.04 Trusty (latest upgrade)
Hardware: Asus U36JC
Graphic Driver: nvidia-331

I have opened a bug #1296020 (Non-existent display detected in both intel driver and nvidia driver).
Except the non-existent display issue, nvidia-settings can not detect any real displays. The only display/monitor it can detect is the non-existent one. I think this should be a different bug for nvidia-331. 

For "xrandr -q" output, please refer to bug #1296020. nvidia-settings
becomes useless now, it can not detect the built-in display and it can
not detect any new external display. It can only detect the non-existent
CRT-0 (VGA-0). Gnome control center --> Display can detect all displays.
(but it fails to rotate external VGA display. not sure if this is
another bug or not).

I will attach two screenshots for nvidia-settings and gnome-control-
center --> display.

NOTE: due to the bug #1296020 and gdm flickering issue, I have added the
following section to xorg.conf:

Section "Monitor"
    Identifier "VGA-0"
    Option "Ignore" "True"
EndSection

AND, xorg.conf is auto-generated by some package. I never created it
manually. It might be generated by gpu-manager (I was told).

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-19.39-generic 3.13.6
Uname: Linux 3.13.0-19-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 4.8.2-17ubuntu1)
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Tue Mar 25 12:53:34 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.7, 3.13.0-18-generic, x86_64: installed
 bbswitch, 0.7, 3.13.0-19-generic, x86_64: installed
 nvidia-331, 331.38, 3.13.0-18-generic, x86_64: installed
 nvidia-331, 331.38, 3.13.0-19-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: No
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 18) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:1542]
 NVIDIA Corporation GT218M [GeForce 310M] [10de:0a70] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:1542]
InstallationDate: Installed on 2014-03-04 (20 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
MachineType: ASUSTeK Computer Inc. U36JC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-19-generic root=UUID=0d039a7c-cdff-4d22-9604-569584977a76 ro quiet splash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/26/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: U36JC.205
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: U36JC
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.:bvrU36JC.205:bd01/26/2011:svnASUSTeKComputerInc.:pnU36JC:pvr1.0:rvnASUSTeKComputerInc.:rnU36JC:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: U36JC
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.
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 Mar 25 12:36:33 2014
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.0-1ubuntu7

** Affects: nvidia-settings (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty ubuntu
-- 
nvidia-settings can not detect any real displays/monitors (trusty) (Optimus Laptop)
https://bugs.launchpad.net/bugs/1297090
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