Public bug reported:

Steps to Reproduce:
1. Install Ubuntu Gnome14.04 on a freshly formatted PC with 2 screens
2. Using "Additional Drivers", install latest Nvidia driver (331)
3. Modify screen settings (e.g. change position of 2 screens as depicted in 
attached Screens_good.gif)
4. Turn secondary screen off and back on - OR - reboot
5. Observe that screen settings have been reverted

Actual Results:
Ubuntu forgets the screen settings made in either NVidia-settings or Ubuntu's 
own "Displays" tool. The screen settings are reverted to the default (screen 2 
to the right of screen 1) after reboot or when turning the second screen off 
and back on.

Expected Results:
Ubuntu should apply the user's defined screen settings when the second screen 
is turned on.

Notes:
The test PC has two devices connected to a GeForce GTX 680 (Gigabyte 
GV-N680OC-2GD) card:
1. Samsung SyncMaster screen via DVI
2. Yamaha RX-V 661 5.1 surround receiver via HDMI (recognized by Ubuntu as a 
second screen)
Encountered in Ubuntu Gnome 14.04, 64 bit
Encountered with NVidia drivers 331, 331 update and 304 (legacy)

Reading Xorg.0.log, one can see that the user's desired settings are
actually applied more than once (exerpts):

[     5.252] (II) NVIDIA(0): Validated MetaModes:
[     5.252] (II) NVIDIA(0):     
"DVI-I-0:1920x1200_60+0+1080,HDMI-0:1920x1080_60i+1920+0"
[     5.252] (II) NVIDIA(0): Virtual screen size determined to be 1920 x 2280
[     5.275] (--) NVIDIA(0): DPI set to (93, 95); computed from "UseEdidDpi" X 
config
[     5.275] (--) NVIDIA(0):     option
[     5.275] (--) Depth 24 pixmap format is 32 bpp
[     5.275] (II) NVIDIA: Using 3072.00 MB of virtual memory for indirect memory
[     5.275] (II) NVIDIA:     access.
[     5.281] (II) NVIDIA(0): Setting mode 
"DVI-I-0:1920x1200_60+0+1080,HDMI-0:1920x1080_60i+1920+0"

At the very end, an unknown process takes over and reverts the previous
desired settings to the undesired default (line 3):

[     7.196] (II) XKB: reuse xkmfile 
/var/lib/xkb/server-A237F4D5ECC0A2998042D3B58D9A7CE5E820BA0E.xkm
[     7.208] (II) NVIDIA(0): Setting mode "NULL"
[     7.270] (II) NVIDIA(0): Setting mode "DVI-I-0: nvidia-auto-select 
@1920x1200 +0+0 {ViewPortIn=1920x1200, ViewPortOut=1920x1200+0+0}"
[     7.469] (II) XKB: reuse xkmfile 
/var/lib/xkb/server-A237F4D5ECC0A2998042D3B58D9A7CE5E820BA0E.xkm
[     7.474] (II) XKB: reuse xkmfile 
/var/lib/xkb/server-A237F4D5ECC0A2998042D3B58D9A7CE5E820BA0E.xkm
[     7.496] (II) NVIDIA(GPU-0): Display (Samsung SyncMaster (CRT-0)) does not 
support NVIDIA
[     7.496] (II) NVIDIA(GPU-0):     3D Vision stereo.
[    41.097] (II) XKB: reuse xkmfile 
/var/lib/xkb/server-A237F4D5ECC0A2998042D3B58D9A7CE5E820BA0E.xkm
[   511.720] (II) NVIDIA(GPU-0): Display (Samsung SyncMaster (CRT-0)) does not 
support NVIDIA

Attachments: screenshots of desired screen settings (Screens_good.gif) and 
default screen settings (Screens.gif)
This issue occurs regardless of whether the user makes the desired settings in 
Ubuntu's "Display" tool or NVidia-Settings.
This issue persists even after specifically saving the desired settings to 
xorg.conf using NVidia-Settings.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-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 4.8.2-19ubuntu1)
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Tue Apr 22 18:14:34 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.7, 3.13.0-24-generic, x86_64: installed
 nvidia-331-updates, 331.38, 3.13.0-24-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation GK104 [GeForce GTX 680] [10de:1180] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: Gigabyte Technology Co., Ltd Device [1458:353c]
InstallationDate: Installed on 2014-04-20 (2 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 
(20140416.2)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic 
root=UUID=c651e8be-8145-4f89-9f68-919286e646bb ro quiet splash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/20/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080015
dmi.board.name: JW-A870T-UC3
dmi.board.vendor: JW Technology
dmi.board.version: V1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr080015:bd05/20/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnJWTechnology:rnJW-A870T-UC3:rvrV1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
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 10.1.0-4ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
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 22 17:30:17 2014
xserver.configfile: default
xserver.errors: open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.15.1-0ubuntu2

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


** Tags: 331 amd64 apport-bug dual-screen forget nvidia screen settings trusty 
ubuntu

** Attachment added: "Screens_good.gif"
   
https://bugs.launchpad.net/bugs/1311399/+attachment/4093437/+files/Screens_good.gif

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1311399

Title:
  Ubuntu 14.04 forgets Display Settings from monitors.xml / xorg.conf
  (Dual-Screen Setup)

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