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