"no screen found" found with dvi-i

Hi!

I have installed openSUSE 11.1 x86_64 and ATI Radeon x1550 with VGA, DVI-I outputs.

Using VGA output is ok, but xorg X Server reports an errors when I try to use DVI-I output on the same monitor.

Windows XP SP3 and Ubuntu 8.10 LiveCD works correctly with DVI-I output.

What’s wrong?

xorg.conf


# /.../
# SaX generated X11 config file
# Created on: 2009-04-07T01:23:41+0500.
#
# Version: 8.1
# Contact: Marcus Schaefer <sax@suse.de>, 2005
# Contact: SaX-User list <https://lists.berlios.de/mailman/listinfo/sax-users>
#
# Automatically generated by [ISaX] (8.1)
# PLEASE DO NOT EDIT THIS FILE!
#
Section "Files"
  FontPath     "/usr/share/fonts/misc:unscaled"
  FontPath     "/usr/share/fonts/local"
  FontPath     "/usr/share/fonts/75dpi:unscaled"
  FontPath     "/usr/share/fonts/100dpi:unscaled"
  FontPath     "/usr/share/fonts/Type1"
  FontPath     "/usr/share/fonts/URW"
  FontPath     "/usr/share/fonts/Speedo"
  FontPath     "/usr/share/fonts/PEX"
  FontPath     "/usr/share/fonts/cyrillic"
  FontPath     "/usr/share/fonts/latin2/misc:unscaled"
  FontPath     "/usr/share/fonts/latin2/75dpi:unscaled"
  FontPath     "/usr/share/fonts/latin2/100dpi:unscaled"
  FontPath     "/usr/share/fonts/latin2/Type1"
  FontPath     "/usr/share/fonts/latin7/75dpi:unscaled"
  FontPath     "/usr/share/fonts/baekmuk:unscaled"
  FontPath     "/usr/share/fonts/japanese:unscaled"
  FontPath     "/usr/share/fonts/kwintv"
  FontPath     "/usr/share/fonts/truetype"
  FontPath     "/usr/share/fonts/uni:unscaled"
  FontPath     "/usr/share/fonts/CID"
  FontPath     "/usr/share/fonts/ucs/misc:unscaled"
  FontPath     "/usr/share/fonts/ucs/75dpi:unscaled"
  FontPath     "/usr/share/fonts/ucs/100dpi:unscaled"
  FontPath     "/usr/share/fonts/hellas/misc:unscaled"
  FontPath     "/usr/share/fonts/hellas/75dpi:unscaled"
  FontPath     "/usr/share/fonts/hellas/100dpi:unscaled"
  FontPath     "/usr/share/fonts/hellas/Type1"
  FontPath     "/usr/share/fonts/misc/sgi:unscaled"
  FontPath     "/usr/share/fonts/xtest"
  FontPath     "/opt/kde3/share/fonts"
  InputDevices "/dev/gpmdata"
  InputDevices "/dev/input/mice"
EndSection

Section "ServerFlags"
  Option       "AllowMouseOpenFail" "on"
  Option       "ZapWarning" "on"
EndSection

Section "Module"
  Load         "glx"
  Load         "dbe"
  Load         "extmod"
  Load         "dri"
  Load         "freetype"
EndSection

Section "InputDevice"
  Driver       "kbd"
  Identifier   "Keyboard[0]"
  Option       "Protocol" "Standard"
  Option       "XkbLayout" "us,ru"
  Option       "XkbModel" "microsoftpro"
  Option       "XkbOptions" "grp:ctrl_shift_toggle,grp_led:scroll"
  Option       "XkbRules" "xfree86"
  Option       "XkbVariant" ",winkeys"
EndSection

Section "InputDevice"
  Driver       "mouse"
  Identifier   "Mouse[1]"
  Option       "Buttons" "9"
  Option       "Device" "/dev/input/mice"
  Option       "Name" "ImExPS/2 Logitech Wheel Mouse"
  Option       "Protocol" "explorerps/2"
  Option       "Vendor" "Sysp"
  Option       "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
  DisplaySize  376 301
  HorizSync    30-81
  Identifier   "Monitor[0]"
  ModelName    "SAMSUNG SYNCMASTER"
  Option       "DPMS"
  Option       "PreferredMode" "1280x1024"
  VendorName   "SAM"
  VertRefresh  43-75
  UseModes     "Modes[0]"
EndSection

Section "Modes"
  Identifier   "Modes[0]"
  Modeline 	"1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066
EndSection

Section "Screen"
  DefaultDepth 24
  SubSection "Display"
    Depth      15
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480" 
    Virtual    3840 1200
  EndSubSection
  SubSection "Display"
    Depth      16
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480" 
    Virtual    3840 1200
  EndSubSection
  SubSection "Display"
    Depth      24
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480" 
    Virtual    3840 1200
  EndSubSection
  SubSection "Display"
    Depth      8
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480" 
    Virtual    3840 1200
  EndSubSection
  Device       "Device[0]"
  Identifier   "Screen[0]"
  Monitor      "Monitor[0]"
EndSection

Section "Device"
  BoardName    "Radeon X1300/X1550"
  Driver       "radeonhd"
  Identifier   "Device[0]"
  Option       "SaXDualHead"
  Option       "monitor-VGA_1" "Monitor[0]"
  Option       "SaXDualMonitorVendor" "SAM"
  Option       "SaXDualOrientation" "LeftOf"
  Option       "SaXDualResolution" "1280x1024"
  Option       "SaXDualMode" "Clone"
  Option       "SaXDualHSync" "30-81"
  Option       "SaXDualMonitorModel" "SAMSUNG SYNCMASTER"
  Option       "SaXDualVSync" "50-75"
  Option       "SaXExternal" "Identifier&EXT+DisplaySize&376 301+VendorName&SAM+PreferredMode&1280x1024+HorizSync&30-81+ModelName&SAMSUNG SYNCMASTER+VertRefresh&50-75"
  Screen       0
  VendorName   "ATI"
EndSection

Section "Monitor"
  DisplaySize  376 301
  HorizSync    30-81
  Identifier   "EXT"
  ModelName    "SAMSUNG SYNCMASTER"
  Option       "PreferredMode" "1280x1024"
  VendorName   "SAM"
  VertRefresh  50-75
EndSection

Section "ServerLayout"
  Identifier   "Layout[all]"
  InputDevice  "Keyboard[0]" "CoreKeyboard"
  InputDevice  "Mouse[1]" "CorePointer"
  Option       "Clone" "off"
  Option       "Xinerama" "off"
  Screen       "Screen[0]"
EndSection

Section "DRI"
    Group      "video"
    Mode       0660
EndSection

Section "Extensions"
EndSection

Note: Monitor is connected to PC with an DVI-VGA adapter.

The same occurs with nVidia 8500GT.