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DisplayLink setup on macbook pro fails...

hi,
I'm checking the list of available Displays using the following code:
int maxDisplays = 2;
CGDirectDisplayID onlineDisplayIDs[maxDisplays];
CGDisplayCount displayCount;
CGGetOnlineDisplayList(maxDisplays, onlineDisplayIDs, &displayCount);
printf("displayCount is %d ", displayCount);
CVReturn res = CVDisplayLinkCreateWithCGDisplay(onlineDisplayIDs[0], &_displayLink);
if(res == kCVReturnSuccess) {
CVDisplayLinkSetOutputCallback(_displayLink, _displayLinkCallBack, self);
}
else {
_displayLink = NULL;
printf("failed");
}
as expected, I get a displaycount of 2, if I have another display attached to my macbook pro, respectively 1 if not, so I assume I did this right.
res has always a value of -6670 - it doesn't matter which display I select.
The macbook pro is the 1.83/128mb GRAM model, with 10.4.6 and qt 7.1
What can I do? Who can reproduce the problem on another intel mac?

Thanks
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