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429 uart IDLE flag not available in DMA receive?

Question asked by mei.raymond on Mar 16, 2015
I use UART + DMA to receive unknown length packet, and use IDLE interrupt to monitor the end of the packet. It can recevie IDLE interrupt, but in HAL_UART_IRQHandler I read SR register and  IDLE flag is 0. I never enable any other interrupt except IDLE.
If I use pure IT mode and not use DMA, I can see the IDLE=1. 
Is it a bug of UART hardware? Can anyone give a tips?  
Thanks in advance.