Tim, Jeff and Eugene, thank you for your answers. It is good to know that I am not the only one with this problem. But changing driver architecture or implementing my own streaming interface is not really a solution that I expected to do.... @Tim : no video, but multi stereo : My device is multichannel and implements 6 stereo wave miniports (IMiniportWavePci). The customer application is streaming to the 6 wave devices. Couldn't someone from Microsoft give an advice what I should/could do ? - Creating a support ticket for MSDN subscription for this problem ? - Trying to file a Windows bug - Re-writing my driver and embedded firmware in case of Microsoft ignoring this, even if there are more than 3 companies able to reproduce ? Best regards, Markus. 2012/2/16 Eugene Muzychenko <eugene@xxxxxxxxxxxxxx> > Hello Jeff, > > > I spent some months hunting for possible causes in my driver code > > (and I think I may have raised the issue here) but got nowhere > > The same thing. I encountered it several years ago in XP, 2003, Vista > and Win7. Asked here and in MS newsgroups but no success. Finally I > have added my own IOCTL_KS_READ_STREAM/IOCTL_KS_WRITE_STREAM > processing. > > Regards, > Eugene > > ****************** > > WDMAUDIODEV addresses: > Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx > Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe > Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe > Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx > > URL to WDMAUDIODEV page: > http://www.wdmaudiodev.com/ > >