[PD] alsa crashing on recent Pi OS

[Linux ROUEN Normandie]

Hello Yann,

On my side I'm running an up-to-date RPi OS 11 32-bit Bullseye (Full 
version) since ~ 2 years on an overclocked RPi 400 (RPi 4 @ 2.4 GHz with 
an embedded keyboard + 4 GB RAM).
I'm building Pd from its source currently latest v.0.54.1 ('apt-get 
install puredata' gives you an old version of Pd), and my MIDI/Audio 
patches are running smoothly with an external cheap USB Audio adapter.
When I will have access to my RPi 400 I will run your patches and will 
report.

Screen capture done on Linux Mint 21.2 - Choose this RPi OS Full (or 
Lite) for your tests:


I haven't tested RPi OS 12 64-bit Bookworm (Full) yet on my RPi 400.
Like you I have red there are a lot of changes and especially with the 
Audio 
<https://www.raspberrypi.com/news/bookworm-the-new-version-of-raspberry-pi-os/>.

Best,
Joseph Gastelais
--------------------

Le 01/12/2023 à 09:03, Yann Seznec a écrit :
> Hi again,
>
> I’m wondering if anyone else is having the same issue as me. I’m 
> trying to run Pd patches on Raspberry Pi, and I (perhaps naively) 
> thought that I would use the latest Pi OS.
>
> I seem to be having far more issues than I had in the past, namely 
> with alsa crashing. It seems like virtually any patch I run will 
> sooner or later crash and print hundreds of lines of this error:
> restartalsa output alsa xrun recovery apparently failed
>
> Someone on the Pd Forums 
> <https://forum.pdpatchrepo.info/topic/14536/alsa-crashing-on-pi/7> suggested 
> that this could be an issue with the latest Pi OS switching to 
> PipeWire, which seems to make some sense. But before I attempt any 
> fixes, I wanted to see if anyone else was running into this problem or 
> might have some suggestions.
>
> Alternatively, can anyone suggest to me a version of the raspberry pi 
> operating system that works well for Pd? Perhaps it will be easiest 
> for me to track down an old OS image and just stick to that.
>
> Here are a few more details of what I’m trying, which is ending up 
> with this issue:
>
> - Using both a Raspberry Pi 3 and 4
> - Installing the latest Pi OS using the official Pi imager. I believe 
> this was slightly different versions for the Pi 3 and Pi 4, but the 
> end result was the same anyway.
> - I am using the “lite” version so it’s all command line.
> - installing Pd from the repo (apt-get install puredata). I am not 
> certain what version this is…I think 0.50?
> - Trying to run a small granular patch like this 
> <https://github.com/yannseznec/humanCall> or a sampler/looper patch 
> like this <https://github.com/yannseznec/soundDestroyer>
> - I have tried running with a higher block size (up to 1024) thinking 
> that maybe the patches were too intense. This didn’t seem to help.
> - This is perhaps unrelated, but I did notice that I needed to specify 
> the audio output in the command I’m using to launch the patch. I’m 
> pretty certain this wasn’t necessary in patches I have run on a Pi 
> before.
>
> I always get the errors described above. I recognise that this is 
> somewhat anecdotal, but I am really certain that I was able to run 
> much more complicated patches on a Pi several years ago without issue, 
> so this all feels very new to me.
>
> Many thanks,
>
> Yann
>
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