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[William Harryman <william.harryman@xxxxxxxxx>]

I have the same error on my laptop, running 14.04 LTS with an AMD Radeon Mobility HD 5800 series graphics card. I attempted to plug in a monitor into the HDMI and one into the VGA ports, while running the laptop screen. From researching, it appears that this card, and presumably others, only allow two "legacy" connections , and I'm assuming that one of those connections is taken up by the laptop monitor, preventing the "third" monitor from being activated - if I activate the HDMI monitor, the VGA switches off, and vice versa, again with the unintelligible error messages observed above (I think mine said CRTC 148/149, and same "unmapped Quark" error. 
If your graphics card has a DisplayPort, you can use an 'active' adapter and plug in the third monitor, as one solution.
Hopefully this description can help run down the string error msg, and at least this description might help someone who arrives here by Google.

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https://bugs.launchpad.net/bugs/1304627

Title:
  Can't enable third screen on Samsung NP700Z5C

Status in unity-control-center package in Ubuntu:
  Confirmed

Bug description:
  [Background]
  I have a Samsung NP700Z5C laptop. This has two external display connectors: one HDMI and one proprietary mini-VGA 

  The laptop has a 1600x900 display. I also have two 24" 1920x1080
  monitors. One is plugged into the HDMI port (this works as expected).
  The other is plugged, via an adapter (model AA-AV2N12B), into the
  mini-VGA port. This does not work correctly.

  I have experienced a number of issues:

  [1.]
  The system does not detect the mini-VGA display correctly. 

  It appears in the Screen Display dialog as 'Unknown Display', and is
  disabled by default. If I have the system set up as described above,
  then the other two monitors work correctly at their native
  resolutions. Clicking the toggle to enable the second 24" monitor (the
  'Unknown Display') produces the following error message:

  >The selected configuration for displays could not be applied
  >could not set the configuration for CRTC 65

  And then the mini-VGA monitor is enabled - but at the wrong resolution
  (1024x768). The other monitor is disabled automatically.

  [2.]
  With the system in the state at the end of [1.], I attempted to re-enable the HDMI monitor - but received the following two error messages:

  >Failed to apply configuration: %s
  >GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._gnome_2drr_2derror_2dquark.Code2: could not set the configuration for CRTC 65

  >The selected configuration for displays could not be applied
  >could not set the configuration for CRTC 65

  The mini-VGA monitor remained enabled (at the wrong resolution), while
  the HDMI monitor was not re-enabled as expected. In order to re-enable
  the HDMI monitor, I had to first disable the mini-VGA monitor.

  [3.]
  If the

  >The selected configuration for displays could not be applied
  >could not set the configuration for CRTC 65

  message is not closed quickly enough, the following error message is
  displayed:

  >Failed to apply configuration: %s
  >Timeout was reached

  Apart from anything, there appears to be some kind of format string
  issue here.

  _________________________________________________________________

  Notes:

  * I tried to set the mini-VGA monitor resolution with xrandr --mode, but got a similar error message.
  * Triple-head doesn't really matter to me - though it should work - I just want to use the dual monitors when they're plugged in. I can't do this, because I can't find a way to set the resolution of the mini-VGA monitor correctly.
  * This setup works fine under Windows 7 - though I did have to fiddle a bit to set it up initially.

  _________________________________________________________________

  -- System info

  Description:	Ubuntu Trusty Tahr (development branch)
  Release:	14.04

  -- Package info

  unity-control-center:
    Installed: 14.04.3+14.04.20140328-0ubuntu1
    Candidate: 14.04.3+14.04.20140407-0ubuntu1
    Version table:
       14.04.3+14.04.20140407-0ubuntu1 0
          500 http://gb.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
   *** 14.04.3+14.04.20140328-0ubuntu1 0
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity-control-center 14.04.3+14.04.20140328-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
  Uname: Linux 3.13.0-23-generic x86_64
  ApportVersion: 2.14.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Apr  8 20:32:33 2014
  EcryptfsInUse: Yes
  ExecutablePath: /usr/bin/unity-control-center
  InstallationDate: Installed on 2014-04-05 (2 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: unity-control-center
  UpgradeStatus: No upgrade log present (probably fresh install)
  usr_lib_unity-control-center:
   activity-log-manager 0.9.7-0ubuntu12
   deja-dup             30.0-0ubuntu4

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