Subj : aplay oddity
To   : Adrian
From : Vincent Coen
Date : Fri Oct 24 2025 15:39:35


Hello Adrian!

Look through your logs to see what updates have occurred between the two
date/time periods.



23 Oct 25 19:09, you wrote to all:

 > Pi3 running Bookworm.

 > I have a python program that runs continuously, that will when it
 > detects an event call aplay to play a short tune.

 > This has been working fine, until today.  I had to reboot the Pi
 > earlier today, and now the python won't play aplay (the python is
 > running as it logs when the event happens).

 > If I do a cut and paste of the aplay command, it works fine.  So the
 > problem looks as though it is some thing to do with the python call.
 > Both command line and python are running under the same user.

 > What I'm seeing logged by the python code is the following error :

 > ALSA lib pcm_dmix.c:999:(snd_pcm_dmix_open) unable to open slave
 > aplay: main:831 audio open error: Unknown error 524

 > I've tried rebooting again, and an Internet search doesn't come up
 > with anything for my particular problem (they all seem to be "nothing
 > working").

 > Any suggestions on what to hit with the big hammer ?

 > TIA

 > Adrian
 > --
 > To Reply :
 > replace "bulleid" with "adrian" - all mail to bulleid is rejected
 > Sorry for the rigmarole, If I want spam, I'll go to the shops
 > Every time someone says "I don't believe in trolls", another one dies.



Vincent


--- Mageia Linux v9 X64/Mbse v1.1.1/GoldED+/LNX 1.1.5-b20240604
 * Origin: Air Applewood, The Linux Gateway to the UK & Eire (2:250/1)

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