Comment 0 for bug 1296020

There is a non existent display detected in both intel driver only and nvidia 331 driver installation.
The non existent display is "Unknown Display" shown in gnome-control-center --> display and "CRT-0" in nvidia-settings, and "VGA-0" in xrandr -q output.
It will cause gdm failed to start. gnome-shell has some crazy layouts. lightdm will only occupy 2/3 of monitor in top left corner.
I tested this in intel driver only environment. and nvidia-331 installation environment.
My laptop is Asus U36JC. My monitor correct resolution is 1366x768.

The following is the output of "xrandr -q" in gnome-shell with nvidia-331 installed:

$ xrandr -q
Screen 0: minimum 8 x 8, current 1366 x 768, maximum 8192 x 8192
VGA-0 connected primary 680x384+0+0 (normal left inverted right x axis y axis) 0mm x 0mm panning 1366x768+0+0
   680x384 60.0*+
   1366x768 60.0
   1360x768 60.0
HDMI-0 disconnected (normal left inverted right x axis y axis)
LVDS-1-0 connected 1366x768+0+0 (normal left inverted right x axis y axis) 293mm x 165mm
   1366x768 60.0*+
   1360x768 59.8 60.0
   1024x768 60.0 60.0
   960x720 60.0
   928x696 60.1
   896x672 60.0
   960x600 60.0
   960x540 60.0
   800x600 60.0 60.3 56.2
   840x525 60.0 59.9
   800x512 60.2
   700x525 60.0
   640x512 60.0
   720x450 59.9
   640x480 60.0 59.9
   680x384 59.8 60.0
   576x432 60.1
   512x384 60.0
   400x300 60.3 56.3
   320x240 60.1
VGA-1-0 disconnected (normal left inverted right x axis y axis)
HDMI-1-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-0 disconnected (normal left inverted right x axis y axis)
  1366x768 (0x46) 69.3MHz
        h: width 1366 start 1425 end 1464 total 1472 skew 0 clock 47.1KHz
        v: height 768 start 773 end 782 total 785 clock 60.0Hz
  1360x768 (0x48) 72.0MHz
        h: width 1360 start 1408 end 1440 total 1520 skew 0 clock 47.4KHz
        v: height 768 start 771 end 781 total 790 clock 60.0Hz
  680x384 (0x5c) 36.0MHz
        h: width 680 start 704 end 720 total 760 skew 0 clock 47.4KHz
        v: height 384 start 385 end 390 total 395 clock 60.0Hz

The following is the output of "xrandr -q" in lxde with nvidia-331 installed:

$ xrandr -q
Screen 0: minimum 8 x 8, current 1366 x 768, maximum 8192 x 8192
VGA-0 connected primary 1024x768+31+0 (normal left inverted right x axis y axis) 0mm x 0mm panning 1366x768+0+0
   680x384 60.0 +
   1366x768 60.0
   1360x768 60.0
HDMI-0 disconnected (normal left inverted right x axis y axis)
LVDS-1-0 connected 1366x768+0+0 (normal left inverted right x axis y axis) 293mm x 165mm
   1366x768 60.0*+
   1360x768 59.8 60.0
   1024x768 60.0 60.0
   960x720 60.0
   928x696 60.1
   896x672 60.0
   960x600 60.0
   960x540 60.0
   800x600 60.0 60.3 56.2
   840x525 60.0 59.9
   800x512 60.2
   700x525 60.0
   640x512 60.0
   720x450 59.9
   640x480 60.0 59.9
   680x384 59.8 60.0
   576x432 60.1
   512x384 60.0
   400x300 60.3 56.3
   320x240 60.1
VGA-1-0 disconnected (normal left inverted right x axis y axis)
HDMI-1-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-0 disconnected (normal left inverted right x axis y axis)
  1366x768 (0x46) 69.3MHz
        h: width 1366 start 1425 end 1464 total 1472 skew 0 clock 47.1KHz
        v: height 768 start 773 end 782 total 785 clock 60.0Hz
  1360x768 (0x48) 72.0MHz
        h: width 1360 start 1408 end 1440 total 1520 skew 0 clock 47.4KHz
        v: height 768 start 771 end 781 total 790 clock 60.0Hz
  1024x768 (0x4a) 65.0MHz
        h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.4KHz
        v: height 768 start 771 end 777 total 806 clock 60.0Hz
  680x384 (0x5c) 36.0MHz
        h: width 680 start 704 end 720 total 760 skew 0 clock 47.4KHz
        v: height 384 start 385 end 390 total 395 clock 60.0Hz

Note: this Unknown non-existent display happens in intel driver only environment. If required, I can provide "xrandr -q" output with that environment. At present, I don't bother to remove/purge my nvidia-331 installation.

Please let me know if anything else is required. Thank you very much!

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6
Uname: Linux 3.13.0-18-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 4.8.2-16ubuntu6)
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: LXDE
Date: Sat Mar 22 18:47:26 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.7, 3.13.0-17-generic, x86_64: installed
 bbswitch, 0.7, 3.13.0-18-generic, x86_64: installed
 nvidia-331, 331.38, 3.13.0-18-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 (17 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
MachineType: ASUSTeK Computer Inc. U36JC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-18-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: Sat Mar 22 12:36:00 2014
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.0-1ubuntu7