I have a reproducible case where I get a pipe stalls for my USBBulkIn
pipes (no data is send on those pipes) when my device is connected to
the keyboard hub on an Intel iMac.
I have 3 usb in pipes. 2 are no having any data and one is constantly
receiving data until the driver buffer is full at which point I no
longer issue a ReadPipeAsync.
The one receiving data has no problem but the other 2 are getting
constantly kIOUSBPipeStalled errors which can be cleared but they
return right away.
As soon as I connect the device to the hub on the back of the iMac
the stalls are gone.
My code is a universal binary.
I've files this as RADAR #4444150.
So in case anyone of you is have similar problems you may not want to
waste a lot of time, simple plug the device into hub of the iMac itself.
Martin
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