Public bug reported:

Binary package hint: gnome-screensaver

With the screen saver on, the one of the two monitors on my Dell Dim
5100  will display fine, while the other will 'go to static' like an old
tv.

Some here would call them 'artifacts'.

I thought it was first the issue with the 2nd display, but testing shows
it flips.

System:
X driver = NVidia (6600GT) / Hardware drivers version 185 
OS = Ubuntu karmic (development branch), kernel 2.6.31-10-generic
Screen Saver = 'sky rockets'

--------------------------------------------------------------
$ apt-cache policy gnome-screensaver
gnome-screensaver:
  Installed: 2.27.0-0ubuntu6
  Candidate: 2.27.0-0ubuntu6
  Version table:
 *** 2.27.0-0ubuntu6 0
        500 http://us.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status
----------------------------------------------------------------
kern.log.1:Sep 18 10:22:00 tfritz-desktop kernel: [120827.001648] 
gnome-screensav[27380]: segfault at 78e8f700 ip b7558c36 sp bf9bcad8 error 6 in 
libGL.so.180.44[b74f3000+8d000]
kern.log.1:Sep 18 10:22:00 tfritz-desktop kernel: [120836.910881] 
gnome-screensav[27492]: segfault at fc243800 ip b74e5c36 sp bf949a58 error 6 in 
libGL.so.180.44[b7480000+8d000]
-----------------------------------------------------------------

Xorg.0.log:
X.Org X Server 1.6.3
Release Date: 2009-7-31
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-23-server i686 Ubuntu
Current Operating System: Linux tfritz-desktop 2.6.31-10-generic #34-Ubuntu SMP 
Wed Sep 16 00:23:19 UTC 2009 i686
Kernel command line: root=UUID=1bb1bd64-9ad2-4ce1-896e-e2830e9a0ea6 ro 
xforcevesa quiet splash 
Build Date: 08 September 2009  11:15:47PM
xorg-server 2:1.6.3-1ubuntu6 ([email protected]) 
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Fri Sep 18 12:28:05 2009
(==) Using config file: "/etc/X11/xorg.conf"
(==) ServerLayout "Default Layout"
(**) |-->Screen "Screen0" (0)
(**) |   |-->Monitor "Monitor0"
(**) |   |-->Device "Device0"
(**) Option "Xinerama" "0"
(==) Automatically adding devices
(==) Automatically enabling devices
(WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
        Entry deleted from font path.
(==) FontPath set to:
        /usr/share/fonts/X11/misc,
        /usr/share/fonts/X11/100dpi/:unscaled,
        /usr/share/fonts/X11/75dpi/:unscaled,
        /usr/share/fonts/X11/Type1,
        /usr/share/fonts/X11/100dpi,
        /usr/share/fonts/X11/75dpi,
        /var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType,
        built-ins
(==) ModulePath set to "/usr/lib/xorg/modules"
(II) Cannot locate a core pointer device.
(II) Cannot locate a core keyboard device.
(II) The server relies on HAL to provide the list of input devices.
        If no devices become available, reconfigure HAL or disable 
AllowEmptyInput.
(II) Loader magic: 0x1fbc0
(II) Module ABI versions:
        X.Org ANSI C Emulation: 0.4
        X.Org Video Driver: 5.0
        X.Org XInput driver : 4.0
        X.Org Server Extension : 2.0
(II) Loader running on linux
(++) using VT number 7
(--) PCI:*(0:1:0:0) 10de:0140:1b13:0140 nVidia Corporation NV43 [GeForce 6600 
GT] rev 162, Mem @ 0xe8000000/67108864, 0xd8000000/134217728, 
0xee000000/16777216, BIOS @ 0x????????/131072
(WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
(II) No APM support in BIOS or kernel
(II) System resource ranges:
        [0] -1  0       0xffffffff - 0xffffffff (0x1) MX[B]
        [1] -1  0       0x000f0000 - 0x000fffff (0x10000) MX[B]
        [2] -1  0       0x000c0000 - 0x000effff (0x30000) MX[B]
        [3] -1  0       0x00000000 - 0x0009ffff (0xa0000) MX[B]
        [4] -1  0       0x0000ffff - 0x0000ffff (0x1) IX[B]
        [5] -1  0       0x00000000 - 0x00000000 (0x1) IX[B]
(II) "extmod" will be loaded by default.
(II) "dbe" will be loaded by default.
(II) "glx" will be loaded. This was enabled by default and also specified in 
the config file.
(II) "record" will be loaded by default.
(II) "dri" will be loaded by default.
(II) "dri2" will be loaded by default.
(II) LoadModule: "glx"
(II) Loading /usr/lib/xorg/modules/extensions//libglx.so
(II) Module glx: vendor="NVIDIA Corporation"
        compiled for 4.0.2, module version = 1.0.0
        Module class: X.Org Server Extension
(II) NVIDIA GLX Module  185.18.36  Fri Aug 14 17:50:12 PDT 2009
(II) Loading extension GLX
(II) LoadModule: "extmod"
(II) Loading /usr/lib/xorg/modules/extensions//libextmod.so
(II) Module extmod: vendor="X.Org Foundation"
        compiled for 1.6.3, module version = 1.0.0
        Module class: X.Org Server Extension
        ABI class: X.Org Server Extension, version 2.0
(II) Loading extension MIT-SCREEN-SAVER
(II) Loading extension XFree86-VidModeExtension
(II) Loading extension XFree86-DGA
(II) Loading extension DPMS
(II) Loading extension XVideo
(II) Loading extension XVideo-MotionCompensation
(II) Loading extension X-Resource
(II) LoadModule: "dbe"
(II) Loading /usr/lib/xorg/modules/extensions//libdbe.so
(II) Module dbe: vendor="X.Org Foundation"
        compiled for 1.6.3, module version = 1.0.0
        Module class: X.Org Server Extension
        ABI class: X.Org Server Extension, version 2.0
(II) Loading extension DOUBLE-BUFFER
(II) LoadModule: "record"
(II) Loading /usr/lib/xorg/modules/extensions//librecord.so
(II) Module record: vendor="X.Org Foundation"
        compiled for 1.6.3, module version = 1.13.0

xdpyinfo:
name of display:    :0.0
version number:    11.0
vendor string:    The X.Org Foundation
vendor release number:    10603000
X.Org version: 1.6.3
maximum request size:  16777212 bytes
motion buffer size:  256
bitmap unit, bit order, padding:    32, LSBFirst, 32
image byte order:    LSBFirst
number of supported pixmap formats:    7
supported pixmap formats:
    depth 1, bits_per_pixel 1, scanline_pad 32
    depth 4, bits_per_pixel 8, scanline_pad 32
    depth 8, bits_per_pixel 8, scanline_pad 32
    depth 15, bits_per_pixel 16, scanline_pad 32
    depth 16, bits_per_pixel 16, scanline_pad 32
    depth 24, bits_per_pixel 32, scanline_pad 32
    depth 32, bits_per_pixel 32, scanline_pad 32
keycode range:    minimum 8, maximum 255
focus:  window 0x400022, revert to PointerRoot
number of extensions:    30
    BIG-REQUESTS
    Composite
    DAMAGE
    DOUBLE-BUFFER
    DPMS
    DRI2
    GLX
    Generic Event Extension
    MIT-SCREEN-SAVER
    MIT-SHM
    NV-CONTROL
    NV-GLX
    RANDR
    RECORD
    RENDER
    SECURITY
    SHAPE
    SYNC
    X-Resource
    XC-MISC
    XFIXES
    XFree86-DGA
    XFree86-VidModeExtension
    XINERAMA
    XINERAMA
    XInputExtension
    XKEYBOARD
    XTEST
    XVideo
    XVideo-MotionCompensation
default screen number:    0
number of screens:    1

screen #0:
  dimensions:    2560x1024 pixels (765x313 millimeters)
  resolution:    85x83 dots per inch
  depths (7):    24, 1, 4, 8, 15, 16, 32
  root window id:    0x1a7
  depth of root window:    24 planes
  number of colormaps:    minimum 1, maximum 1
  default colormap:    0x20
  default number of colormap cells:    256
  preallocated pixels:    black 0, white 16777215
  options:    backing-store NO, save-unders NO
  largest cursor:    64x64
  current input event mask:    0x7a803f
    KeyPressMask             KeyReleaseMask           ButtonPressMask          
    ButtonReleaseMask        EnterWindowMask          LeaveWindowMask          
    ExposureMask             StructureNotifyMask      SubstructureNotifyMask   
    SubstructureRedirectMask FocusChangeMask          PropertyChangeMask       
  number of visuals:    120
  default visual id:  0x21
  visual:
    visual id:    0x21
    class:    TrueColor
    depth:    24 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0xff0000, 0xff00, 0xff
    significant bits in color specification:    8 bits
<snip>

** Affects: gnome-screensaver (Ubuntu)
     Importance: Undecided
         Status: New

-- 
video on a monitor messed up with screensaver (2 displays)
https://bugs.launchpad.net/bugs/434188
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