[alsa-devel] Audio:suspend to ram issue

Rajeev kumar rajeev-dlh.kumar at st.com
Thu Aug 18 12:51:37 CEST 2011

Hello Mark
In the continuation of the last mail.I run alsa_aplay and the WAV file 
Then press ctrl-z - aplay will go to background(suspend state) and i2s 
is stopped.
Then type fg and the audio  restart.
Is there any difference between these two suspend  ctrl-z and echo mem > 
In both the cases trigger will call with cmd value '1 ' in case of 
resume and '0' in case of suspend.

While going through the alsa framework I found that suspend and resume 
functionality is handled by
the framework itself.Please correct me if my understanding is not correct.

Best Regards

On 8/18/2011 11:35 AM, Rajeev kumar wrote:
> Hi Mark
> I am not sure about the behavior in case of audio suspend/resume.
> I tested the audio driver with aplay and then suspended to ram (using 
> echo mem > /sys/power/state). After pressing wake to resume,
> the audio does not play unless aplay is closed and re-run.  Do we 
> expect the audio suspend/resume to work?
> In the platform trigger part I am doing nothing and in case of 
> cpu(i2s) , just disabling the i2s.
> Best Regards
> Rajeev

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