[ltp] t42 and dual-head/mergedfb

[Sebastian von Swiontek-Brzezinski]

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hi list,

i'm owning a t42 (2373-5wg) with an ati radeon 7500 (Radeon Mobility M7 
LW) with 32MB ram. I tried to connect an external monitor (a 19" tft and 
a possible resolution of 1280x1024) to expand my screen, not cloning. My 
ThinkPad LCD is able to show 1024x768. At first i tried to use mergedfb. 
It works, but then my thinkpad lcd has a virtual 1280x1024 resolution 
and i have to scroll. But i do not like this!!!
So i tried to use two devices, two monitors and two screens with 
xinerama. When I start x, my kde is on the right side open and my mouse 
pointer disappers. But the problem is, that the graphic card does not 
enable the external output and my tft gets no signal.

Perhaps the following line of my xorg-log is the reason:
(WW) RADEON(0): Failed to detect secondary monitor, MergedFB/Clone mode 
disabled

Does anybody knows, how to activate this?
Thanks in advance,
Sebastian

Here is my xorg.conf:
Section "ServerLayout"
   Identifier   "Layout[all]"
   InputDevice  "Keyboard[0]" "CoreKeyboard"
   InputDevice  "Mouse[1]" "CorePointer"
   # Option       "Clone" "on"
   Option       "Xinerama" "on"
   Screen       0 "Screen[0]" 0 0
   Screen       1 "Screen[1]" RightOf "Screen[0]"
EndSection

Section "Screen"
   DefaultDepth 24
   SubSection "Display"
     Depth      24
     Modes      "1024x768"
   EndSubSection
   Device       "Device[0]"
   Identifier   "Screen[0]"
   Monitor      "Monitor[0]"
EndSection

Section "Screen"
   DefaultDepth 24
   SubSection "Display"
     Depth      24
     Modes      "1280x1024"
   EndSubSection
   Device       "Device[1]"
   Identifier   "Screen[1]"
   Monitor      "Monitor[1]"
EndSection

Section "Device"
   BoardName    "Radeon LW 1"
   BusID        "1:0:0"
   Driver       "radeon"
   Identifier   "Device[0]"
   Screen       0
   VendorName   "ATI"
   Option       "DynamicClocks"
EndSection

Section "Device"
   BoardName    "Radeon LW 2"
   BusID        "1:0:0"
   Driver       "radeon"
   Identifier   "Device[1]"
   Screen       1
   VendorName   "ATI"
   Option       "DynamicClocks"
EndSection

Section "Monitor"
   DisplaySize  300 230
   HorizSync    31-68
   Identifier   "Monitor[0]"
   ModelName    "1024X768@75HZ"
   VendorName   "--> LCD"
   VertRefresh  50-85
   UseModes     "Modes[0]"
EndSection

Section "Monitor"
   DisplaySize  340 270
   HorizSync    31-82
   Identifier   "Monitor[1]"
   ModelName    "1280X1024@75HZ"
   VendorName   "--> LCD"
   VertRefresh  58-75
EndSection

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