I have been using the Pisound to run a PD patch headless (via the Patchbox module settings) for an audio installation. This has been mostly succesful, but I now encounter situations where the RPi becomes unresponsive at times and needs to be restarted (both green and leds are lit up). I was wondering if there are log files that could be checked to understand what causes the situation? Many thanks for your help with this!
Hi, edit /etc/systemd/journald.conf, make sure this value is set under [Journal] section:
[Journal]
Storage=persistent
This should enable persistent system logs, so you can get info from previous boots after the last crash. For good measure, I create the logs directory too:
sudo mkdir /var/log/journal
Now after a fault occurs, reboot the system and run:
journalctl -b -1
To inspect the previous log. Use -2 to look into an earlier log, etc…
If possible, remotely ssh into the system and leave dmesg -w running, as you may be able to catch some useful information in the kernel log right away as the issue occurs.
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Many thanks for providing the instructions.
I followed the steps, and now encountered another crash for which I wanted to inspect the log.
However, there only seems to be log data for -1 available, when I type in -2 I receive the following message:
Data from the specified boot (-2) is not available: No such boot ID in journal
In any case, should I post the -1 in my reply or rather upload it as a text file? Please let me know which is more convenient for you.
Sure, you may attach the logs here so we can see if there’s any issues. Uploading as a text file would be the most convenient, as the contents can get long.
-2 log is 2 reboots ago, -1 is the previous session log, and 0 would be the currently running session. Just after the fault, -1 would be the most interesting log.
If the issue occurred 2 reboots ago, a restart after changing the settings was likely necessary for the changes to take effect… Forgot to mention it in the steps above. 
So I’ve been having this issue more often when the RPi was idling, and there were a few instances where I came back after a few hours to the RPi and both lights were on. The last time I was no longer able to reboot the device. I suspect this might have something to do with the off-spec SD card, so I bought a SanDisk Extreme PRO 64GB A2 and hope this will fix the issue. In case it comes back I’ll copy the logs and post them here!
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