[Bug 250248] 12.2-RC2 kernel reboots with hw.acpi.debug=1 after a warm reboot.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250248

--- Comment #6 from Andriy Gapon <avg at FreeBSD.org> ---
(In reply to Rajeev Pillai from comment #5)
If you can some (light) code modifications and can build a kernel from sources,
then I can try to "throw" a couple of ideas at you.

First, in hdac_attach2(), you can try moving a block of code that starts with
printing of "Enabling controller interrupt" and goes up to "Scanning HDA
codecs" to a place right after the loop that scans for codecs.

But I am not sure if that will really work.
There are calls to hdac_send_command() in the loop.  I am not sure if that
function depends on interrupts.

Another idea is to move just HDAC_WRITE_4(... HDAC_GCTL_UNSOL) line.

Yet another idea is to modify hdac_methods[] array and add device_shutdown
method there.  It can point to hdac_detach.
The idea is to completely reset the hardware _before_ the warm reboot, so it is
more predictable afterwards.

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