X1900 XT, dual display: sleep problems

Today I updated my Mac Pro from an NVIDIA 7300 GT with connected BenQ and Samsung displays to an ATI X1900 XT with two 23" Cinema HD Displays. Everything works fine except one thing:
When trying to put the system to sleep it wakes up again after 2 seconds and a few seconds later the fan goes to highest speed level and stays there. The only possibility to stop the system is to shut it down completely.
The keyboard/mouse are connected to the "first" display, no other USB or Firewire device is connected.
All OS X updates are installed including EFI Update 1.1
Any ideas how to locate the problem?
Thanks in advance,
Wolfgang

Sorry for the unprecise / wrong information. The problem could be solved by removing a USB smart card reader that was attached to the USB hub of the second display.
At the old display it worked fine but the combination Cinema display / Vivanco Smart Card reader produces a signal at the USB that wakes up the Mac Pro immediately. I do not have a clue why the Mac Pro speeds up the fans afterwards but this behavior can be reproduced easily with every USB device that is removed shortly after the Mac went to sleep.
The hint for this could be found in the system.log:
Apr 23 17:45:26 MacPro kernel[0]: System Sleep\
Apr 23 17:45:26 MacPro kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes\
Apr 23 17:45:26 MacPro kernel[0]: Started CPU 01\
Apr 23 17:45:26 MacPro kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes\
Apr 23 17:45:26 MacPro kernel[0]: Started CPU 02\
Apr 23 17:45:26 MacPro kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes\
Apr 23 17:45:26 MacPro kernel[0]: Started CPU 03\
Apr 23 17:45:26 MacPro kernel[0]: System Wake\
Apr 23 17:45:26 MacPro kernel[0]: USB caused wake event (EHCI)\

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