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[Daniel <dnogueira86@xxxxxxxxx>]

I have the same problem : Unity does not load after enabling xinerama
13.04

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https://bugs.launchpad.net/bugs/1175797

Title:
  Unity does not load after enabling xinerama 13.04

Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  It seems like every Ubuntu release breaks my quad monitor setup....

  I have two GeForce GT 520's and am running 4 monitors, 3 HP S2031's
  and one Westinghouse L1975NW turned 90deg. This was working fine with
  the current LTS. I decided it was time to upgrade my desktop, as I've
  been running 13.04 on my laptop for a month now (started in beta) with
  no issues. Here are the steps that have brought me to this point:

  1. After installing a fresh cut of 13.04, I was left with 2 HP's on a
  single 520 card mirroring eachother (Not uncommon to start out this
  way, all the way back since 10.04). I opened display settings and saw
  it detected all 4 monitors right off the bat. I got excited... first
  time this has happened. I unchecked "Mirrored" and it enabled all 4
  monitors. After a restart, it kinda worked, but the contents monitor 3
  & 4 kept swapping back and forth, so if I drug a window over to
  monitor 3 it would jump between 3 & 4 rapidly... this continued even
  if I drug it over to monitor 4.

  2. I disabled this and went to software & updates and additional
  drivers and chose the latest nvidia driver & restarted. Still no luck,
  and still no Nivida-settings. Oh, and after trying to tweak the
  settings a bit more, I ended up in a login loop. I would login, the
  screens would go black and kick me right back to the login page. I
  could get into the guest account no problem. I ended up having to
  delete a config file (after backing it up... not remembering which
  atm) in order for unity to regenerate the default of that file and
  allow me back into unity without the login loop.

  3. I downloaded the latest nvidia drivers from nvidia's site
  (nvidia-313-updates) and followed their instructions for installing.
  Rebooted, and behold, I have two monitors working in twinview. I
  backed up my xorg.conf and opened nvidia-settings. I configured all 4
  monitors, applied settings, saved settings and restarted. I was
  excited to see all four monitors working for the login screen! ...
  then I logged in and Unity no longer opens. I ctrl+alt+f1'd and
  restored my xorg.conf and restarted. I have since tried several times
  to make this work, and every time, unity will not launch.

  I, like may others I am sure, am a web developer and multi-monitor is
  a key to huge productivity gains for me. I don't want to have to go
  back to LTS, I am loving some of the newer 13.04 features, but I need
  this to work!!!

  If anyone has any other suggestions, or even a video card
  recommendation  (sub $200) that will support 4 monitors and not die
  and leave me stranded with every OS update, I am all ears!

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