Wrong Screenresolution on Apple 15" analog Studio Display under 10.5

Hi everybody,
I'm still using one of the good old blue TFT 15" Studio Displays with VGA and ADB connectors as my secondary display. The correct resolution should be 1024x768px at either 60hz or 75hz.
When the display is connected and I start the machine, the display shows a scaled narrow image and display settings show me that the screen is running at 1280x768px (funny .
When disconnected at start time and connected later on, the display runs fine.
I tried the usual stuff like resetting the pram and so on.
Before updating to 10.5 everything was fine. Any ideas what might be wrong ?
Best regards,
Matt

Hello,
I'm just using the following as an example:
<MacBook Pro (2.4/2.2GHz): External display only supports 1440 x 900 after Mac OS X 10.5.2 and Leopard Graphics Update
Symptoms
An external display connected to a MacBook Pro (2.4/2.2GHz) may only support 1440 x 900 resolution after installing Mac OS X 10.5.2 and the Leopard Graphics Update.
Resolution
Apply the MacBook Pro EFI Firmware Update 1.5.>
Perhaps there is a firmware update you need... check out this link... the very first Mac OS update to 10.5.4. http://www.apple.com/support/downloads/
Carolyn

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Wrong Screenresolution on Apple 15" analog Studio Display under 10.5

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