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Fedora 8 doesn't use my external monitor

Laptop attached to docking station, and through that to an external

Booting F8, external display behaves normally at first, but when
graphical stuff starts, it does some flickering (like a TV in need of
horizontal hold adjustment) then goes blank and stays blank.  Laptop
display continues to work normally.  

I'm only trying to display the same desktop simultaneously on both
displays.  No split desktops or double desktops, or anything fancy.

It all worked properly with FC5, and subsequent upgrades to FC6 and then
F7.  Problem appeared only on upgrade to F8.  All F8 updates applied.
Everything still works normally if I boot Windows XP instead of F8.

Config is: Compaq Evo N1020v laptop with Radeon IGP 340M graphics.
External display is just an old Gateway EV500 15" CRT.  Both displays
are 1024*768.

/etc/X11/xorg.conf reads:
        Section "ServerLayout"
        	Identifier     "single head configuration"
        	Screen      0  "Screen0" 0 0
        	InputDevice    "Keyboard0" "CoreKeyboard"
        Section "InputDevice"
        	Identifier  "Keyboard0"
        	Driver      "kbd"
        	Option	    "XkbModel" "pc105"
        	Option	    "XkbLayout" "gb"
        Section "Monitor"
        	Identifier   "Monitor0"
        	ModelName    "LCD Panel 1024x768"
        	HorizSync    31.5 - 37.9
        	VertRefresh  50.0 - 70.0
        Section "Device"
        	Identifier  "Videocard0"
        	Driver      "radeon"
        Section "Screen"
        	Identifier "Screen0"
        	Device     "Videocard0"
        	Monitor    "Monitor0"
        	DefaultDepth     24
        	SubSection "Display"
        		Viewport   0 0
        		Depth     24
        	SubSection "Display"
        		Viewport   0 0
        		Depth     16
        		Modes    "800x600"
If anyone can see what's wrong here, I'll be very grateful!

Gordon Hay

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