Hello Joseph and everyone,

Thanks for the very helpful feedback. I have copied your setup as closely as possible, and the situation seems much improved. I did two things:

• install the 32 bit RPi OS 11 Bullseye Full Version on my Raspberry Pi 4. I believe I may have been installing the 64 bit version previously.
• compiled Pure Data from source in order to get v 0.54.1 as you described.

So far in my first tests I have been able to run a granular patch without any crashes. I also no longer need to specify the audio device in the startup command. Pd will still occasionally print the same error "restart alsa output alsa xrun recovery apparently failed”, but it doesn’t seem to matter. Most of the time it seems to only print it once on launch.

Changing the OS and the Pd build at the same time was not a good way to determine exactly what the problem was, of course! So I have not yet found an explanation but this is a promising way forward. It feels likely that the 64 bit OS was the problem. If I figure out any more details I will post them here.

As a side note, perhaps someone more knowledgeable than me could update the version of Pd that is currently accessible from apt-get? I didn't mind compiling from source but it is pretty handy to be able to just do apt-get when setting up a new Pi.

Merci beaucoup,

Yann

Message: 1 Date: Fri, 1 Dec 2023 16:23:59 +0100 From: Linux ROUEN Normandie linux.rouen@free.fr To: pd-list@lists.iem.at Subject: Re: [PD] alsa crashing on recent Pi OS Message-ID: 0a824a13-e31d-4cde-8346-2caa5cfc6d5a@free.fr Content-Type: text/plain; charset="utf-8"; Format="flowed"

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

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Le 01/12/2023 ? 09:03, Yann Seznec a ?crit?:

...

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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