From: Ryutaroh Matsumoto <ryuta...@ict.e.titech.ac.jp>
Subject: vc4.ko brings unusable&unstable ALSA sinks
Date: Fri, 26 Mar 2021 17:15:40 +0900 (JST)
> Touching vc4-hdmi-[01] too many times makes the kernel unstable,
> and shutting down often needs several minutes.
> /usr/bin/pulseaudio in its default setting touches all available ALSA sinks
> and causes the above inconvenience.
> I mainly use HDMI audio output, and
In my last email, a pointed reproducing procedure should have been given:
0. Assume an RPi4B and a high resolution HDMI display.
1. Install pulseaudio on a sensible distro with the upstream kernel and systemd,
e.g. https://raspi.debian.net
2. Make a non-root user and login as that user.
3. Run the following script by the non-root user:
#!/bin/sh
set -x
while true; do
systemctl --user status pulseaudio
pacmd list-sinks
pacmd exit
systemctl --user restart pulseaudio
done
Then every command in the above script gets stuck or fails.
I also prepared an SD card image that can reproduce the reported symptom
on RPi4B 8GB at http://153.240.174.134:64193/tmp/sdimage8GB.img.xz
(268,112,012 bytes).
Best regards, Ryutaroh
