[Bug 300154] [regression] no sound via HDMI on Kaby Lake

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=300154

            Bug ID: 300154
           Summary: [regression] no sound via HDMI on Kaby Lake
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: glebius@FreeBSD.org

Created attachment 276573
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=276573&action=edit
dmesg with verbose boot

My X1 Carbon 7th Gen lost audio output via HDMI.  Unfortunately, I don't
exercise this functionality often, thus I can't tell how recent the regression
is.  I guess it is somewhere between summer 2025 and summer 2026.

Booted with 'boot -v' and with HDMI cable plugged in, dmesg.boot.txt attached.
Switched hw.snd.default_unit=1. sndctl and mixer output attached. Trying
playback - no sound produced and not messages in dmesg. Went through sleep &
resume cycle - no changes.

However, at previous boot, without HDMI cable plugged in and without 'boot -v',
after plugging in the HDMI cable and trying playback I was
seeing messages in dmesg:
Oct 27 13:09:25 <kern.crit> think kernel: hdac0: Command 0x20220011 timeout on
address 2
Oct 27 13:09:25 <kern.crit> think kernel: hdac0: Command 0x20270d01 timeout on
address 2
Oct 27 13:09:25 <kern.crit> think kernel: hdac0: Command 0x20270610 timeout on
address 2
Oct 27 13:09:25 <kern.crit> think kernel: hdac0: Command 0x20272d01 timeout on
address 2
Oct 27 13:09:25 <kern.crit> think kernel: hdac0: Command 0x20373400 timeout on
address 2
Oct 27 13:09:25 <kern.crit> think kernel: hdac0: Command 0x20373411 timeout on
address 2
Oct 27 13:09:26 <kern.crit> think kernel: hdac0: Command 0x203734f2 timeout on
address 2
Oct 27 13:09:26 <kern.crit> think kernel: hdac0: Command 0x203734f3 timeout on
address 2  
Oct 27 13:09:26 <kern.crit> think kernel: hdac0: Command 0x203734f4 timeout on
address 2
Oct 27 13:09:26 <kern.crit> think kernel: hdac0: Command 0x203734f5 timeout on
address 2
Oct 27 13:09:26 <kern.crit> think kernel: hdac0: Command 0x203734f6 timeout on
address 2
Oct 27 13:09:26 <kern.crit> think kernel: hdac0: Command 0x203734f7 timeout on
address 2
Oct 27 13:09:26 <kern.crit> think kernel: hdac0: Command 0x20370740 timeout on
address 2 
Oct 27 13:09:26 <kern.crit> think kernel: hdac0: Command 0x20373000 timeout on
address 2
Oct 27 13:09:26 <kern.crit> think kernel: hdac0: Command 0x20373200 timeout on
address 2
Oct 27 13:09:26 <kern.crit> think kernel: hdac0: Command 0x20373000 timeout on
address 2
Oct 27 13:09:26 <kern.crit> think kernel: hdac0: Command 0x20373100 timeout on
address 2
Oct 27 13:09:30 <kern.crit> think syslogd: last message repeated 31 times

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