Public bug reported:

Binary package hint: xorg

Ubuntu Feisty with all the updates:
Xorg 7.2.0 on Linux 2.6.20-16-generic, AMD Atlhon64 X2 5800+ with 3GB of RAM. 
Two video cards, an integrated ATI Radeon X1250 and a PCI Mach64 Rage Pro AIW:
01:05.0 VGA compatible controller: ATI Technologies Inc Unknown device 791e
03:06.0 VGA compatible controller: ATI Technologies Inc 3D Rage Pro (rev 5c)
I'm using a multiseat configuration. It work fine, mostly. One problem is that 
the screens in the second screen (mach64) shifts right and wraps around at 
seemingly random times, mostly a few seconds after initialization. Looking with 
Google I found a similar problem (http://www.mail-archive.com/[EMAIL 
PROTECTED]/msg150582.html), but in their case seemed to be related to screen 
blanking, that is not the case for me. Anyway, I tried to write random text to 
/dev/console, and the screen does shift around! It takes eight lines like:
echo "some random text">/dev/console
to produce a complete rotation back to the original position. I'm running at 
1152x864, 75Hz refresh rate, but if I change to, say 1280x1024, 60Hz the effect 
remains the same.

My Xorg.conf is as follows:

# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf(5) manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "ServerFlags"
        Option  "DefaultServerLayout"   "alltogether"
        Option  "AllowMouseOpenFail"    "true"
        Option  "AIGLX"                 "true"
EndSection

Section "ServerLayout"
        Identifier      "alltogether"
        Screen  0       "Screen0"       0 0
        Screen  1       "Screen1"       RightOf "Screen0"
        InputDevice     "PS2Mouse"      "CorePointer"
        InputDevice     "PS2Kbd"        "CoreKeyboard"
        InputDevice     "UsbMouse"      "CorePointer"
        InputDevice     "UsbKbd"        "CoreKeyboard"
EndSection

Section "ServerLayout"
        Identifier      "Seat0"
        Screen  0       "Screen0"       0 0
        InputDevice     "PS2Mouse"      "CorePointer"
        InputDevice     "PS2Kbd"        "CoreKeyboard"
        Option          "Composite"     "0"
EndSection

Section "ServerLayout"
        Identifier      "Seat1"
        Screen  1       "Screen1"       0 0
        InputDevice     "UsbMouse"      "CorePointer"
        InputDevice     "UsbKbd"        "CoreKeyboard"
        Option          "Composite"     "1"
        Option          "XVideo"        "Enable"
EndSection

Section "Files"
        # path to defoma fonts
        FontPath     "/usr/share/fonts/X11/misc"
        FontPath     "/usr/share/fonts/X11/cyrillic"
        FontPath     "/usr/share/fonts/X11/100dpi/:unscaled"
        FontPath     "/usr/share/fonts/X11/75dpi/:unscaled"
        FontPath     "/usr/share/fonts/X11/Type1"
        FontPath     "/usr/share/fonts/X11/100dpi"
        FontPath     "/usr/share/fonts/X11/75dpi"
        FontPath     "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
        Load    "dbe"
        Load    "extmod"
        Load    "fbdevhw"
        Load    "glx"
        Load    "record"
        Load    "bitmap"
        Load    "ddc"
        Load    "dri"
        Load    "freetype"
        Load    "int10"
        Load    "vbe"
EndSection

Section "InputDevice"
        Identifier      "PS2Kbd"
        Driver          "evdev"
        Option          "Device"        "/dev/input/event1"
        Option          "XkbModel"      "evdev"
        Option          "XkbLayout"     "us"
EndSection

Section "InputDevice"
        Identifier      "PS2Mouse"
        Driver          "evdev"
        Option          "Device"        "/dev/input/event5"
        Option          "Protocol"      "IMPS/2"
        Option          "ZAxisMapping"  "4 5"
EndSection

Section "InputDevice"
        Identifier      "UsbKbd"
        Driver          "evdev"
        Option          "Device"        "/dev/input/event2"
        Option          "XkbModel"      "evdev"
        Option          "XkbLayout"     "us"
EndSection

Section "InputDevice"
        Identifier      "UsbMouse"
        Driver          "evdev"
        Option          "Protocol"      "IMPS/2"
        Option          "Device"        "/dev/input/event3"
        Option          "ZAxisMapping"  "4 5"
EndSection

Section "Monitor"
        Identifier      "Acer77e"
        HorizSync       30.0 - 72.0
        VertRefresh     50.0 - 120.0
        Option          "DPMS"
EndSection

Section "Monitor"
        Identifier      "Trinitron"
        HorizSync       30.0 - 72.0
        VertRefresh     50.0 - 120.0
        Option          "DPMS"
EndSection

Section "Device"
        Identifier      "RadeonX1250"
        Driver          "fglrx"
        VideoRam        32000
        BusID           "PCI:1:5:0"
EndSection

Section "Device"
        Identifier      "RagePro"
        Driver          "ati"
        BusID           "PCI:3:6:0"
        Option          "DDCMode"       "True"
        Option          "VideoOverlay"  "on"
        Screen 0
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "RadeonX1250"
        Monitor    "Acer77e"
        DefaultDepth     24
        SubSection "Display"
                Depth     1
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     4
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     8
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     15
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     16
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     24
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
EndSection

Section "Screen"
        Identifier "Screen1"
        Device     "RagePro"
        Monitor    "Trinitron"
        DefaultDepth     24
        SubSection "Display"
                Depth     1
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     4
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     8
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     15
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     16
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth     24
                Modes    "1280x1024" "1024x768" "800x600" "640x480"
        EndSubSection
EndSection

Section "DRI"
        Mode         0666
EndSection

Section "Extensions"
        Option  "Composite" "0"
EndSection

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

-- 
screen shifts right when /dev/console written to
https://bugs.launchpad.net/bugs/153425
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