Hi Tomasz, Running aplay I get this timeout, on kernel side: sof-audio-of 3b6e8000.dsp: error: ipc timed out for 0x60040000 size 12 This is the command for SOF_IPC_STREAM_TRIG_START. What I notice on SOF side is: -> irq_handle (new message from SOF arrives) -> ipc_schedule_process -> schedule_ipc_task -> run: ipc_platform_do_cmd -> pipeline_trigger() -> schedule pipe_task -> then pipeline_copy starts to RUN Now the problem is that even if pipeline_copy() runs in a separate schedulable task, ipc_task doesn't get a chance to run so the reply for TRIGGER command isn't sent back to host hence the timeout. My question: Does pipeline_copy() runs in some special context so that normal EDF tasks can meet their deadline? I do have a slightly new firmware then the kernel, not sure about what recent changes have been done to firmware. thanks, Daniel.