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[Nazar Mokrynskyi <nazar@xxxxxxxxxxxxxx>]

Just noticed that on Ubuntu 16.04 xorg.conf is actually removed on restart, which is why I'm always loaded with Intel driver instead of Nvidia on my laptop.
This happened within updated during last 2 days, everything worked fine before.
What happens, why file is REMOVED?

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https://bugs.launchpad.net/bugs/1310489

Title:
  xorg.conf overwritten by booting system

Status in Linux Mint:
  New
Status in ubuntu-drivers-common package in Ubuntu:
  Fix Released
Status in ubuntu-drivers-common source package in Trusty:
  Fix Released

Bug description:
  Description:	Ubuntu 14.04 LTS
  Release:	14.04

  ----------------

  == SRU Request ==

  There is a regression in the gpu-manager that causes it to revert user
  changes right before the first reboot after enabling the fglrx driver
  or the nvidia driver on a system with hybrid graphics (Intel+AMD or
  Intel+NVIDIA). This causes the gpu-manager to remove the current
  xorg.conf and to switch to Mesa.

  [Impact]
   * This regression makes it almost impossible to use binary drivers on systems with hybrid graphics.

  [Test Case]
   * Make sure to be using a hybrid system with Intel+AMD or Intel+NVIDIA GPUs.

   * Make sure that the gpu-manager is not disabled (only necessary if
  you disabled it manually).

   * Remove all fglrx and nvidia drivers (keep the nvidia-common and the nvidia-prime packages):
     sudo apt-get --purge remove nvidia-331
     sudo apt-get --purge remove nvidia-331
     sudo apt-get --purge remove fglrx
     sudo apt-get --purge remove fglrx-updates

   * Install ubuntu-drivers-common from trusty-proposed.

   * Restart the system.

   * Install the binary driver (either fglrx or nvidia, according to the available discrete GPU), reboot, and check that the binary driver is enabled (attach your /var/log/gpu-manager.log)
      - Expected: the (AMD or NVIDIA) discrete GPU is enabled.
      - Bad behavior: the system switches back to the intel driver and the discrete GPU is not used, despite the fact that the system was configured properly.

  [Regression Potential]
   * Low. Systems that currently work will keep working as usual, the ones that currently fail should finally work.

  [Other Info]
   * N/A

  -----------------

  Hello,

  I am using a notebook with a quadcore AMD A10 and hybrid graficcard AMD/ATI Radeon HD 8650G / AMD/ATI Sun XT Radeon HD 8670A/8670M/8690M.
  After installing fglrx I generated the xorg.conf in the terminal with 'sudo aticonfig --adapter=all --initial' and it looked pretty good. Up to this point I was able to switch between the cards with the commands 'sudo aticonfig --px-dgpu' for the discrete card and 'sudo aticonfig --px-igpu' for the intigrated card to save power.
  After rebooting I realized that I was no longer able to switch between the cards and found that the xorg.conf will be overwritten whenever I modified it and reboot the system. The new (by boot) generated xorg.conf contains not the relevant information for switing between the cards.
  I attached both configuration in one file (xorg.conf.comparison). I will also provide the atisysteminfo-report.txt so far I will find the place where to attach.

  Edit: I fixed the error --> "AIGLX error: failed to open
  /usr/lib64/dri/fglrx_dri.so, error[/usr/lib64/dri/fglrx_dri.so: cannot
  open shared object file: No such file or directory]" but it changed
  not the bug of overwriting the xorg.conf.

  Regards,
  Uwe

  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: fglrx
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: Unity
  Date: Mon Apr 21 08:43:29 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus: fglrx, 13.350.1, 3.13.0-24-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Richland [Radeon HD 8650G] [1002:990b] (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1985]
     Subsystem: Hewlett-Packard Company Device [103c:1985]
  InstallationDate: Installed on 2014-04-20 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Hewlett-Packard HP Pavilion 17 Notebook PC
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=fdcb1eaf-eda9-48ee-9d5b-b44e1fc06687 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/26/2013
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.22
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 1985
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 01.13
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnInsyde:bvrF.22:bd09/26/2013:svnHewlett-Packard:pnHPPavilion17NotebookPC:pvr0892100000005910000600000:rvnHewlett-Packard:rn1985:rvr01.13:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP Pavilion 17 Notebook PC
  dmi.product.version: 0892100000005910000600000
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  version.fglrx-installer: fglrx-installer 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.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: Mon Apr 21 08:29:06 2014
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   open /dev/dri/card0: No such file or directory
   AIGLX error: failed to open /usr/X11R6/lib64/modules/dri/fglrx_dri.so, error[/usr/X11R6/lib64/modules/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
   AIGLX error: failed to open /usr/lib64/dri/fglrx_dri.so, error[/usr/lib64/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
   AIGLX error: failed to open /usr/X11R6/lib/modules/dri/fglrx_dri.so, error[/usr/X11R6/lib/modules/dri/fglrx_dri.so: cannot open shared object file: No such file or directory]
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.1-0ubuntu2
  xserver.video_driver: fglrx

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