[mythtv-users] Screen is getting blanked

[M A]

I recently upgraded my Fedora 8 box to latest atrpms
and mythtv. I also installed nvidia drivers (not open
source).
However, the my screen gets blanked after half hour.
Not sure what is causing it, since I have removed the
dpms line from xorg.conf. 
The 'xset -dpms' command no longer works. It gives
error about extension dpms not being installed.

Here is my xorg.conf.. anything I am missing ??

# nvidia-xconfig: X configuration file generated by
nvidia-xconfig
# nvidia-xconfig:  version 1.0 
(buildmeister at builder3)  Thu Feb 14 18:20:37 PST
 2008

# Xorg configuration created by system-config-display
#Section "Files"
#        ModulePath  
"/usr/lib/xorg/modules/nvidia-graphics-100.14.11"
#EndSection

Section "ServerLayout"
    Identifier     "Default layout"
    Screen      0  "Screen0" 0 0
    InputDevice    "Mouse0" "CorePointer"
    InputDevice    "Keyboard0" "CoreKeyboard"
    Option         "Xinerama" "off"
    Option         "Clone" "on"
EndSection

Section "Files"
EndSection

Section "Module"
    Load           "glx"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/input/mice"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    Identifier     "Keyboard0"
    Driver         "kbd"
    Option         "XkbModel" "pc101"
    Option         "XkbLayout" "us"
#   Option         "XkbVariant" "intl"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Monitor Vendor"
    ModelName      "Monitor 800x600"
    HorizSync       31.5 - 35.1
    VertRefresh     50.0 - 61.0
EndSection

Section "Device"

    BusID          "PCI:1:0:0"
    Identifier     "Videocard0"
    Driver         "nvidia"
    VendorName     "Videocard Vendor"
    BoardName      "nVidia Corporation NV34 [GeForce
FX 5200]"
    Screen          0
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Videocard0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "NoLogo" "True"
    Option         "TwinView" "yes"
    Option         "TwinViewOrientation" "clone"
    Option         "MetaModes" "800x600, 800x600;
640x480, 640x480"
    Option         "TVStandard" "NTSC-M"
    Option         "Composite" "Enable"
    Option         "ConnectedMonitor" "CRT, TV"
    SubSection     "Display"
        Viewport    0 0
        Depth       24
        Modes      "800x600" "640x480"
    EndSubSection
EndSection

Section "Extensions"
    Option         "Composite" "Enable"
EndSection



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