Re: help testing a vchiq patch

Marco Devesas Campos <[email protected]> Thu, 20 Aug 2026 20:54:17 +0100

Newsgroups	gmane.os.freebsd.devel.arm
Message-ID	<[email protected]>

Hi Bob

> However, there's no hint of any audio output via an old Dell monitor with integrated
> HDMI audio which I know works.

What happens when you ‘cat </dev/random >/dev/dsp’ (maybe as root?)

> There isn't even any random noise as the Pi4 reboots.
> RasPiOS makes a little noise during reboot on a Pi5 during reboot.

Those crackling noises you get when the pi boots are only audible through the audio jack. Seem to recall reading it was something to do with the DAC they use.