Bug#546455: xserver always crashes shortly after boot

[MP <singularita@gmail.com>]

Package: xserver-xorg
Version: 1:7.4+4

About 5-15 minutes after logging in, X server crashes (and thus is
restarted and I am thrown back to login screen again). This happens
every time after boot and only once. Subsequently, X server crashes no
more. I discovered, that first time after boot X server is started on
vt2 and there are some weird characters appearing on that terminal as
the server runs. Once restarted due to crash or manually
(ctrl-alt-backspace), X server is started on vt7 and ordinary getty is
started on vt2. Could that be related to cause of the crash?

In syslog I found only this:
Sep 13 12:17:19 emp-nv acpid: client 3235[0:0] has disconnected
Sep 13 12:17:19 emp-nv acpid: client 3235[0:0] has disconnected
Sep 13 12:17:19 emp-nv wdm: Server for display :0 terminated unexpectedly: 768

I am using wdm 1.28-3.1 and nvidia-kernel-2.6.30-1-amd64 185.18.14-2
Rest of the system is debian unstable, amd64 architecture

# lspci |grep VGA
01:00.0 VGA compatible controller: nVidia Corporation NV40 [GeForce
6800 GT] (rev a1)
# uname -a
Linux emp-nv 2.6.30-1-amd64 #1 SMP Sat Aug 15 18:09:19 UTC 2009 x86_64 GNU/Linux
# grep </proc/cpuinfo name
model name      : AMD Athlon(tm) 64 Processor 3000+

Contents of /etc/X11/xorg.conf:
Section "ServerFlags"
    Option   "DefaultServerLayout" "Default Layout"
#    Option         "AllowClosedownGrabs"
#    Option         "AllowDeactivateGrabs"
    Option   "DontZoom"
    Option   "DontZap"  "false"
#    Option   "HandleSpecialKeys" "Always"
EndSection

Section "ServerLayout"
    Identifier     "Default Layout"
    Screen         "Default Screen" 0 0
    InputDevice    "Generic Keyboard"
    InputDevice    "USB Mouse"
EndSection

Section "Files"
    # local font server
    # if the local font server has problems, we can fall back on these
    FontPath    "unix/:7110"
    FontPath	"/usr/share/fonts/X11/Type1"
    FontPath    "/usr/lib/X11/fonts/Type1"
    FontPath    "/usr/lib/X11/fonts/Speedo"
    FontPath	"/usr/share/fonts/X11/misc"
    FontPath    "/usr/lib/X11/fonts/misc"
    FontPath	"/usr/share/fonts/X11/75dpi"
    FontPath    "/usr/lib/X11/fonts/75dpi"
    FontPath    "/var/lib/defoma/x-ttcidfont-conf.d/dirs/CID"
    FontPath    "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
    Load           "bitmap"
    Load           "dbe"
    Load           "ddc"
    Load           "extmod"
    Load           "freetype"
    Load           "glx"
    Load           "int10"
    Load           "record"
    Load           "type1"
    Load           "vbe"
#	Load	"xtt"
EndSection

Section "InputDevice"
    Identifier     "Generic Keyboard"
    Driver         "keyboard"
    Option         "CoreKeyboard"
    Option         "XkbRules" "xfree86"
    Option         "XkbModel" "pc104"
    Option         "XkbLayout" "us"
    Option         "XkbOptions" "terminate:ctrl_alt_bksp"
EndSection

Section "InputDevice"
    Identifier     "USB Mouse"
    Driver         "mouse"
    Option         "CorePointer"
    Option         "Device" "/dev/input/mice"
    Option         "Protocol" "ImPS/2"
    Option         "Buttons" "8"
    Option         "ZAxisMapping" "4 5"
EndSection


#Section "InputDevice"
#    Identifier     "Generic Mouse"
#    Driver         "mouse"
#    Option         "CorePointer"
#    Option         "SendCoreEvents" "true"
#    Option         "Device" "/dev/input/mice"
#    Option         "Protocol" "Auto"
#EndSection

Section "Monitor"
    Identifier     "dell"
    DisplaySize     400    300
#    HorizSync       30.0 - 115.0
#    VertRefresh     60.0 - 170.0
EndSection

Section "Device"
    Identifier     "enve"
    Driver         "nvidia"
EndSection

Section "Screen"
    Identifier     "Default Screen"
    Device         "enve"
    Monitor        "dell"
    DefaultDepth    24
    Option         "NoLogo" "true"
    Option         "Coolbits" "1"
    SubSection     "Display"
        Depth   24
        Modes   "1600x1200"
    EndSubSection
EndSection