sound device changed on me?

[Tom Horsley]

I was changing some udev rules last night and ran "udevadm trigger"
(which I found on the internet to avoid a reboot).

This morning trying to watch a video, I had no sound. For some reason
my sound output had been set to SPDIF rather than the HDMI I always
had it set to.

Was that a "trigger" side effect, or is something more mysterious going
on (I haven't installed any updates or rebooted).

[Roger Heflin]

A global "udevadm trigger" often has weird effects.

All of the initial setup udev rules get re-run and will re-assert
those settings and override the current state.

Without digging through the udev rules it would be hard to tell, but
in general a udevadm trigger re-executes the udev rules used when the
devices are initially found and can reset devices settings back to the
udev rule(s) want that other applications had changed/overrode.

On Tue, Jul 26, 2022 at 9:37 AM Tom Horsley  wrote:
> I was changing some udev rules last night and ran "udevadm trigger"
> (which I found on the internet to avoid a reboot).
>
> This morning trying to watch a video, I had no sound. For some reason
> my sound output had been set to SPDIF rather than the HDMI I always
> had it set to.
>
> Was that a "trigger" side effect, or is something more mysterious going
> on (I haven't installed any updates or rebooted).
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