I can now definitely confirm that this is a regression in linux 4.3. I just tested with linux 4.2.6 and everything works fine, even though I also see the log message about intel_cpu_fifo_underrun_irq_handler.
Any hope to get this fixed in 4.3 or do we have to wait for 4.4 (including linux-tools, etc.) to hit debian and the backports? Cheers Ronny
