Public bug reported:

I have three monitors all hooked up to a Radeon 6950, using fglrx.  One
of the monitors is in portrait orientation and is a 1680x1050 monitor
while the two monitors in landscape are 1920x1200 monitors.

When I first select a wallpaper (say a wallpaper that is 1920x1200), it
does the Right Thing.  That is, the two landscape monitors show the
wallpaper as you'd expect to see a 1920x1200 image on a 1920x1200 image
display.  The portrait monitor shows a slightly scaled portrait aspect
rectangle out of the center of that wallpaper.

When I leave my computer for some amount of time the wallpaper on the
two landscape monitors is zoomed by what I assume to be the same
percentage as the wallpaper on the portrait monitor.

I say "for some amount of time" because if I set "Turn screen off when
inactive for:" to 1 minute and "Lock screen after:" to 1 minute and then
wake them up and unlock after a few minutes the problem hasn't
manifested itself, but _every_ time I'm away from the computer for
longer periods of time the issue has manifested.

To fix, I merely change the wallpaper to another wallpaper and then back
again.  At this point the wallpaper displays correctly.

See the attached image for screenshots of the issue.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: nautilus 1:3.5.90.really.3.4.2-0ubuntu4.2
ProcVersionSignature: Ubuntu 3.5.0-27.46-generic 3.5.7.7
Uname: Linux 3.5.0-27-generic x86_64
NonfreeKernelModules: fglrx zfs zcommon znvpair zavl zunicode
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Sat Apr 13 10:42:19 2013
ExecutablePath: /usr/bin/nautilus
GsettingsChanges: b'org.gnome.nautilus.window-state' b'geometry' 
b"'1253x986+1673+326'"
InstallationDate: Installed on 2012-10-19 (175 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
ProcEnviron:
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nautilus (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug quantal running-unity third-party-packages

** Attachment added: "Bug, manifested"
   
https://bugs.launchpad.net/bugs/1168705/+attachment/3643230/+files/bug%2C%20manifested.jpg

** Description changed:

  I have three monitors all hooked up to a Radeon 6950, using fglrx.  One
  of the monitors is in portrait orientation and is a 1680x1050 monitor
  while the two monitors in landscape are 1920x1200 monitors.
  
  When I first select a wallpaper (say a wallpaper that is 1920x1200), it
  does the Right Thing.  That is, the two landscape monitors show the
  wallpaper as you'd expect to see a 1920x1200 image on a 1920x1200 image
  display.  The portrait monitor shows a slightly scaled portrait aspect
  rectangle out of the center of that wallpaper.
  
  When I leave my computer for some amount of time the wallpaper on the
  two landscape monitors is zoomed by what I assume to be the same
  percentage as the wallpaper on the portrait monitor.
  
  I say "for some amount of time" because if I set "Turn screen off when
  inactive for:" to 1 minute and "Lock screen after:" to 1 minute and then
  wake them up and unlock after a few minutes the problem hasn't
  manifested itself, but _every_ time I'm away from the computer for
  longer periods of time the issue has manifested.
  
+ To fix, I merely change the wallpaper to another wallpaper and then back
+ again.  At this point the wallpaper displays correctly.
+ 
  See the attached image for screenshots of the issue.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: nautilus 1:3.5.90.really.3.4.2-0ubuntu4.2
  ProcVersionSignature: Ubuntu 3.5.0-27.46-generic 3.5.7.7
  Uname: Linux 3.5.0-27-generic x86_64
  NonfreeKernelModules: fglrx zfs zcommon znvpair zavl zunicode
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: amd64
  Date: Sat Apr 13 10:42:19 2013
  ExecutablePath: /usr/bin/nautilus
  GsettingsChanges: b'org.gnome.nautilus.window-state' b'geometry' 
b"'1253x986+1673+326'"
  InstallationDate: Installed on 2012-10-19 (175 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MarkForUpload: True
  ProcEnviron:
-  PATH=(custom, user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  PATH=(custom, user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  SourcePackage: nautilus
  UpgradeStatus: No upgrade log present (probably fresh install)

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Desktop Bugs, which is subscribed to nautilus in Ubuntu.
https://bugs.launchpad.net/bugs/1168705

Title:
  Multiple monitors with different orientation leads to stretched
  wallpaper when waking up.

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