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Crossfire system: What triggers 2nd card to power up?

Hi folks,

I have a crossfire system and I have a question regarding the strategy in the crimson driver when to wake up the second card. Is this based upon the directx initializing flags used in a program? Normally in windows desktop mode the 2nd card is totally turned off (Zero Core Mode) - but there are some desktop apps (which don't use fullscreen mode - they just use directx for some fancy displaying) which force the crimson driver to power up the 2nd card - I want to understand the trigger for this and seek a solution how to patch those programs.

What is this decision based upon? Is it any flags when initializing directx by some apps?

Please help me understand the crimson / catalyst driver in this topic.

Kind regards

Marcus

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