Public bug reported:

I've been seeing these artifacts on and off ever since I installed
ubuntu well over a year ago.  I reported it to the video driver writers
many months ago, t/he/y shrugged and pointed a finger "that way".
Perhaps you guys will take responsibility for it.  Screen shot attached.
Note carefully, the screenshot is not only of the artifact, but includes
additional info in the pictured terminal window to the left of the
artifact.  Also please note that this artifact persists through all
virtual desktops  Finally, please note that the *contents* of the
artifact changes - this is the first artifact that has done this.  It
seems to grab  random portions of random terminal (Konsole) screens and
the desktop too.  Sometimes it appears above other windows, sometimes
below.  All previous artifacts had static contents and were always above
other windows.  I see artifacts show up maybe once every few months.
Once the first one appears, others typically start to appear shortly
after, until the screen becomes covered to the point that I'm forced to
reboot in order to see anything I'm working on.  The one attached is the
first one so far.  Thank you

$ lsb_release -rd
Description:    Ubuntu 12.04.5 LTS
Release:        12.04


$ apt-cache policy plasma-desktop
plasma-desktop:
  Installed: 4:4.11.6-0ubuntu1~ubuntu12.04.4~ppa3
  Candidate: 4:4.11.6-0ubuntu1~ubuntu12.04.4~ppa3
  Version table:
 *** 4:4.11.6-0ubuntu1~ubuntu12.04.4~ppa3 0
        500 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu/ precise/main 
i386 Packages
        100 /var/lib/dpkg/status
     4:4.8.5-0ubuntu0.3 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main i386 
Packages
     4:4.8.2a-0ubuntu4 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main i386 Packages


$ dpkg --list | grep plasma
ii  kde-plasma-desktop                                          
5:78ubuntu3~ubuntu12.04.1~ppa1                      KDE Plasma Desktop and 
minimal set of applications
ii  libkdeclarative5                                            
4:4.13.2a-0ubuntu0.1~ubuntu12.04~ppa1               declarative library for 
plasma
ii  libplasma-geolocation-interface4                            
4:4.11.6-0ubuntu1~ubuntu12.04.4~ppa3                library for the Plasma 
geolocation
ii  libplasma3                                                  
4:4.13.2a-0ubuntu0.1~ubuntu12.04~ppa1               Plasma Library for the KDE 
Platform
rc  libplasmaclock4abi3                                         
4:4.10.5-0ubuntu0.1~ubuntu12.04~ppa2                library for Plasma clocks
ii  libplasmaclock4abi4                                         
4:4.11.6-0ubuntu1~ubuntu12.04.4~ppa3                library for Plasma clocks
ii  libplasmagenericshell4                                      
4:4.11.6-0ubuntu1~ubuntu12.04.4~ppa3                shared elements for all the 
plasma shells
ii  plasma-dataengines-addons                                   
4:4.13.2-0ubuntu0.1~ubuntu12.04~ppa1                additional data engines for 
Plasma
ii  plasma-dataengines-workspace                                
4:4.11.6-0ubuntu1~ubuntu12.04.4~ppa3                KDE Plasma data engines
ii  plasma-desktop                                              
4:4.11.6-0ubuntu1~ubuntu12.04.4~ppa3                KDE Plasma workspace for 
desktop and laptop computers
ii  plasma-netbook                                              
4:4.11.6-0ubuntu1~ubuntu12.04.4~ppa3                KDE Plasma workspace for 
netbook computers
ii  plasma-scriptengine-javascript                              
4:4.13.2-0ubuntu0.1~ubuntu12.04~ppa4                JavaScript script engine 
for Plasma
ii  plasma-scriptengine-python                                  
4:4.11.6-0ubuntu1~ubuntu12.04.4~ppa3                Python script engine for 
Plasma
ii  plasma-widget-facebook                                      1.0-0ubuntu1    
                                    Plasma Widget for Facebook Updates
ii  plasma-widget-folderview                                    
4:4.13.2-0ubuntu0.1~ubuntu12.04~ppa1                plasma widget showing the 
content of a folder
ii  plasma-widget-kimpanel                                      
4:4.13.2-0ubuntu0.1~ubuntu12.04~ppa1                KIMPanel widget for Plasma
ii  plasma-widget-menubar                                       0.1.17-0ubuntu1 
                                    A Plasma applet to display application 
menubars
ii  plasma-widget-message-indicator                             0.5.8-1ubuntu1  
                                    Plasma widget to display message indicators
ii  plasma-widgets-active                                       
2.0+git2012021101-0ubuntu4~ppa3                     plasma widgets and 
containments for the KDE Plasma Countor Active
ii  plasma-widgets-addons                                       
4:4.13.2-0ubuntu0.1~ubuntu12.04~ppa1                additional widgets for 
Plasma
ii  plasma-widgets-workspace                                    
4:4.11.6-0ubuntu1~ubuntu12.04.4~ppa3                plasma widgets and 
containments for the KDE Plasma Workspace


XdndAware(ATOM) = BITMAP
_MOTIF_DRAG_RECEIVER_INFO(_MOTIF_DRAG_RECEIVER_INFO) = 0x6c, 0x0, 0x5, 0x0, 
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x10, 0x0, 0x0, 0x0
WM_CLIENT_LEADER(WINDOW): window id # 0x1e00004
_NET_WM_PID(CARDINAL) = 3201
_NET_WM_WINDOW_TYPE(ATOM) = _NET_WM_WINDOW_TYPE_DESKTOP
_MOTIF_WM_HINTS(_MOTIF_WM_HINTS) = 0x2, 0x1, 0x0, 0x0, 0x0
WM_PROTOCOLS(ATOM): protocols  WM_DELETE_WINDOW, WM_TAKE_FOCUS, _NET_WM_PING, 
_NET_WM_SYNC_REQUEST
WM_NAME(STRING) = "plasma-desktop"
WM_LOCALE_NAME(STRING) = "en_US.UTF-8"
WM_CLASS(STRING) = "Plasma", "Plasma"
WM_HINTS(WM_HINTS):
                Client accepts input or input focus: True
                Initial state is Normal State.
                bitmap id # to use for icon: 0x1e00202
                window id # of group leader: 0x1e00004
WM_NORMAL_HINTS(WM_SIZE_HINTS):
                user specified location: 0, 0
                program specified location: 0, 0
                user specified size: 1440 by 900
                program specified size: 1440 by 900
                window gravity: Static
WM_CLIENT_MACHINE(STRING) = "myhost.mydomain.com"
WM_COMMAND(STRING) = { "/usr/bin/plasma-desktop" }

$ qdbus org.kde.kactivitymanagerd /ActivityManager/Activities ListActivities
660144e1-e91b-47c8-94f9-537d16c5f694


sudo lshw -C display
  *-display:0             
       description: VGA compatible controller
       product: RV370 [Radeon X300]
       vendor: Hynix Semiconductor (Hyundai Electronics)
       physical id: 0
       bus info: pci@0000:01:00.0
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=radeon latency=0
       resources: irq:43 memory:d0000000-d7ffffff ioport:dc00(size=256) 
memory:dfde0000-dfdeffff memory:dfe00000-dfe1ffff
  *-display:1 UNCLAIMED
       description: Display controller
       product: RV370 [Radeon X300 SE]
       vendor: Hynix Semiconductor (Hyundai Electronics)
       physical id: 0.1
       bus info: pci@0000:01:00.1
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm pciexpress bus_master cap_list
       configuration: latency=0
       resources: memory:dfdf0000-dfdfffff

** Affects: plasma-desktop (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: artifact

** Attachment added: "artifact.png"
   
https://bugs.launchpad.net/bugs/1366647/+attachment/4198197/+files/artifact.png

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https://bugs.launchpad.net/bugs/1366647

Title:
  Artifact left on screen

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