@Hannes Worst and @mackemint  are you using the sound only via HDMI or did you also try analog-audio? For me the sound is distorted only/mostly at HDMI, but there we have no control in the alsamixer The saved alsa-state is only my configuration of analog-audio, which work mostly perfect on my amplified Logitech Speakers.   @Hannes Worst which .dtb version did you use for Ubuntu with the kernel 5.4.33?   Low temperatures I do only get like @Hannes Worst in the command-she