aplay sound starts playing late

nullpointer · May 29, 2020

Armbianmonitor:

my alsa report
Your ALSA information is located at http://alsa-project.org/db/?f=b3736e2229f641d5fd4fb38904d0b3ee6410a5ec

guidol · May 29, 2020

"starts playing late" means that you missing the first seconds?

on some board the amplifier has to be "started" from the system (because it is using a art of power-save for the sound).

This will take up to 3 seconds where you will get no sound....and the system will shut off the amplifier after some seonds with a small "poff"-sound....

I did read about a "switch" in a config-file (like on WiFi powersave) - but I dont know it now from my mind.

Got this also on my OPi Zero....

What I mean is in this thread:

Put the following line at the end of /boot/cmdline.txt

snd-soc-core.pmdown_time=-1

OR
echo -1> /sys/devices/platform/soc/1c22c00.codec/cdc/pmdown_time

Maybe that will help you recover the start of your sound?

guidol · May 29, 2020

Hmm there seems something changed:

root@opi-zero(192.168.6.99):~# echo -1> /sys/devices/platform/soc/1c22c00.codec/cdc/pmdown_time
/sys/devices/platform/soc/1c22c00.codec/cdc/pmdown_time: 
Permission denied

root@opi-zero(192.168.6.99):~# ls -l /sys/devices/platform/soc/1c22c00.codec/cdc/pmdown_time
ls: cannot access '/sys/devices/platform/soc/1c22c00.codec/cdc/pmdown_time': 
No such file or directory

root@opi-zero(192.168.6.99):~# ls -l /sys/devices/platform/soc/1c22c00.codec/cdc/power
total 0
-rw-r--r-- 1 root root 4096 May 29 19:16 autosuspend_delay_ms
-rw-r--r-- 1 root root 4096 May 29 19:16 control
-r--r--r-- 1 root root 4096 May 29 19:16 runtime_active_time
-r--r--r-- 1 root root 4096 May 29 19:16 runtime_status
-r--r--r-- 1 root root 4096 May 29 19:16 runtime_suspended_time

Maybe we have to set the autosuspend_delay_ms to -1 ?

But also
root@opi-zero(192.168.6.99):~# sudo echo -1 > /sys/devices/platform/soc/1c22c00.codec/cdc/power/autosuspend_delay_ms
echo: write error: Input/output error

nullpointer · June 2, 2020

On 5/29/2020 at 7:20 PM, guidol said:

Hmm there seems something changed:


root@opi-zero(192.168.6.99):~# echo -1> /sys/devices/platform/soc/1c22c00.codec/cdc/pmdown_time
/sys/devices/platform/soc/1c22c00.codec/cdc/pmdown_time: 
Permission denied

root@opi-zero(192.168.6.99):~# ls -l /sys/devices/platform/soc/1c22c00.codec/cdc/pmdown_time
ls: cannot access '/sys/devices/platform/soc/1c22c00.codec/cdc/pmdown_time': 
No such file or directory

root@opi-zero(192.168.6.99):~# ls -l /sys/devices/platform/soc/1c22c00.codec/cdc/power
total 0
-rw-r--r-- 1 root root 4096 May 29 19:16 autosuspend_delay_ms
-rw-r--r-- 1 root root 4096 May 29 19:16 control
-r--r--r-- 1 root root 4096 May 29 19:16 runtime_active_time
-r--r--r-- 1 root root 4096 May 29 19:16 runtime_status
-r--r--r-- 1 root root 4096 May 29 19:16 runtime_suspended_time

Maybe we have to set the autosuspend_delay_ms to -1 ?

But also
root@opi-zero(192.168.6.99):~# sudo echo -1 > /sys/devices/platform/soc/1c22c00.codec/cdc/power/autosuspend_delay_ms
echo: write error: Input/output error

Thank you, but these were not the solution.