I just got an answer in there:

"This is a limitation due to the way xrandr works.  It uses a single
surface for all enabled displays rather than one surface per display.
The display hardware has alignment requirements that can cause this
situation since we align the start address down.  The per-crtc pixmaps
work should fix the issue when it finally goes into the xserver."

Now I have a doubt on what's the best procedure to deal with this.
Should we leave this bug report open until xrandx 1.4 is in ubuntu and the 
problem is actually fixed, or it's declared as closed? In my opinion, the bug 
should be kept open until the moment it's actually fixed, even if waiting for 
upstream.

** Bug watch added: freedesktop.org Bugzilla #58652
   https://bugs.freedesktop.org/show_bug.cgi?id=58652

** Also affects: xserver-xorg-driver-ati via
   https://bugs.freedesktop.org/show_bug.cgi?id=58652
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1085338

Title:
  One pixel column that belongs in one monitor shows up in the other
  instead

Status in X.org XServer - ATI gfx chipset driver:
  Unknown
Status in “xserver-xorg-video-ati” package in Ubuntu:
  New

Bug description:
  I have configured the laptop screen in the left and a external monitor
  in the right. On the left most part of the monitor, I can see 1 column
  of pixels that belong to the content that is in the right most part of
  the laptop.

  Strangely, it does not show up when I try to do a screenshot, but is
  quite evident when watching a fullscreen movie in the monitor, for
  example.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: xorg 1:7.7+1ubuntu4
  ProcVersionSignature: Ubuntu 3.7.0-4.12-generic 3.7.0-rc7
  Uname: Linux 3.7.0-4-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.6.3-0ubuntu2
  Architecture: amd64
  CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Sat Dec  1 12:42:13 2012
  DistUpgraded: 2012-11-25 13:52:25,604 DEBUG enabling apt cron job
  DistroCodename: raring
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 4.1.22, 3.7.0-3-generic, x86_64: installed
   virtualbox, 4.1.22, 3.7.0-4-generic, x86_64: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices [AMD] nee ATI Wrestler [Radeon HD 6310] [1002:9802] 
(prog-if 00 [VGA controller])
     Subsystem: Sony Corporation Device [104d:9082]
  InstallationDate: Installed on 2012-11-25 (6 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120627)
  MachineType: Sony Corporation VPCYB16KG
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_SG:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_SG.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.7.0-4-generic 
root=UUID=c5e8db97-be79-41c7-a2d8-be5fa7b409a8 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to raring on 2012-11-25 (5 days ago)
  dmi.bios.date: 12/22/2010
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: R0160Z7
  dmi.board.asset.tag: N/A
  dmi.board.name: VAIO
  dmi.board.vendor: Sony Corporation
  dmi.board.version: N/A
  dmi.chassis.asset.tag: N/A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnInsydeCorp.:bvrR0160Z7:bd12/22/2010:svnSonyCorporation:pnVPCYB16KG:pvrC900K9AU:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
  dmi.product.name: VPCYB16KG
  dmi.product.version: C900K9AU
  dmi.sys.vendor: Sony Corporation
  version.compiz: compiz 1:0.9.8.4+bzr3412-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.40-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.1-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.1-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu8
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.0.0-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.14-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.4-0ubuntu1
  xserver.bootTime: Fri Nov 30 13:03:50 2012
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.13.0-0ubuntu8
  xserver.video_driver: radeon

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