[Bug 286482] iwlwifi firmware prevents resume? (if_iwlwifi and if_iwx)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286482

--- Comment #2 from Pat Maddox <pat@patmaddox.com> ---
(In reply to Bjoern A. Zeeb from comment #1)

Sorry, I am probably using the wrong terminology because there are things I
don't understand. I said firmware because I need to install
wifi-firmware-iwlwifi-kmod-ax210 regardless of whether I use if_iwlwifi or
if_iwx. Forget I said anything about that... I will just share what I've
observed and tried, and not hypothesize about what is causing it.

> You have to down the interface before suspending.

I haven't configured an interface. I am trying to limit this to minimal
reproducible behavior. I observe my laptop being unable to resume, simply by
doing `kldload if_iwlwifi` or `kldload if_iwx` and then `acpiconf -s 3`.
Without either of those kernel modules, I can suspend / resume fine. With
either of those modules loaded, resume doesn't work. The screen doesn't come
back, and the beep sound plays continuously. According to
https://wiki.freebsd.org/SuspendResume that means "if the noise does not stop,
something has gone wrong while resuming a device driver or kernel
panicked/hung."

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