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[Lucas Capalbo Lavezzo <lucas_capalbo@xxxxxxxxxxxx>]

Thanks Christopher, that was fast!
Unchecking X11 Sync objects solved the problem, I'll try to reenable it later if I see some compiz/nvidia update.
Should I understand the correct bug is already reported? if not, should I add some package as affected by this ticket?

Thanks for your help, I really appreciate it! Regards

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https://bugs.launchpad.net/bugs/1425701

Title:
  Unity stopped working after upgrade

Status in compiz package in Ubuntu:
  Incomplete

Bug description:
  After an upgrade last week, Unity stopped working.
  Ligthdm wallpaper (with ubuntu branding on bottom) after login, mouse visible, screen goes black every a few secs, then back to wallpaper and mouse again. 
  Everything worked fine before. Using Ubuntu 14.04.01 (up-to-date), Unity, Nvidia 304-updates drivers.

  I installed gnome2 classic to be able to use my Pc in the meantime.
  Started unity from tty1 with --log option (output attached). Multiple
  compiz (opengl) - Error: FBO is incomplete:
  GL::FRAMEBUFFER_UNSUPPORTED (0x8cdd) seems suspicious.

  What I tried:
  * renamed .compiz, .config, .gconf and .local to force the creation of new default configs. Didn't work.
  * I was able to disable Framebuffer objects in opengl compiz plugin. Got Unity to start, extremely slow and unusable, with the screen going black every few seconds, then normal again, then a black region  moving from bottom to top. Enabled FBO option again.
  * gnome fallback (compiz) didn't work either, only the Metacity version or gnome3 classic, so I guess it's some compiz-nvidia driver issue.
  * Installed new kernel/xorg stack from hardware enablement stack (utopic versions), same issue.
  * Tried nouveau drivers, worked "fine" (as fine as nouveau works on my pc, but at least Unity started normally)
  * Moved to nvidia 304 drivers (no -updates), same issue there. Nvidia 173 is listed as option but won't install.
  * Tried nomodeset kernel option.
  * Downgraded kernel, x server and compiz  to original trusty (no trusty-updates, just trusty), same issue there.
  * Reinstalled ubuntu 14.04.01, same issue after enabling nvidia driver.
  * downloaded ubuntu 14.04.02, same thing.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-46.75-generic 3.13.11-ckt15
  Uname: Linux 3.13.0-46-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Es un directorio: '/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  304.125  Mon Dec  1 19:58:28 PST 2014
   GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Wed Feb 25 17:59:24 2015
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   nvidia-304-updates, 304.125, 3.13.0-45-generic, x86_64: installed
   nvidia-304-updates, 304.125, 3.13.0-46-generic, x86_64: installed
  GraphicsCard:
   NVIDIA Corporation C68 [GeForce 7050 PV / nForce 630a] [10de:053b] (rev a2) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:82b3]
  InstallationDate: Installed on 2015-02-23 (2 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64+mac (20140722.2)
  MachineType: System manufacturer System Product Name
  PackageArchitecture: all
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-46-generic root=UUID=6840a05d-d4c2-4c2c-bde3-34c38de5e0cd ro acpi=off noapic nomodeset quiet splash
  SourcePackage: compiz
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/19/2008
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0905
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M2N-VM DVI
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev x.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0905:bd12/19/2008:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2N-VMDVI:rvrRevx.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1~ubuntu2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.3
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Wed Feb 25 17:58:27 2015
  xserver.configfile: default
  xserver.devices:
   input        HID Keyboard Device  KEYBOARD, id 6
   input        HID Keyboard Device  KEYBOARD, id 7
   input        sonixb               KEYBOARD, id 8
   input        USB Optical Mouse    MOUSE, id 9
  xserver.errors: open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.15.1-0ubuntu2.7

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