[Bug 250009] graphics/drm-fbsd12.0-kmod: sound unusable on DisplayPort after DPMS or screen OFF/ON.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250009

            Bug ID: 250009
           Summary: graphics/drm-fbsd12.0-kmod: sound unusable on
                    DisplayPort after DPMS or screen OFF/ON.
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
             Flags: maintainer-feedback?([email protected])
          Assignee: [email protected]

# uname -a
FreeBSD flash2.usenet-fr.net 12.1-RELEASE-p6 FreeBSD 12.1-RELEASE-p6 GENERIC 
amd64

# pkg info | grep drm-fbsd
drm-fbsd12.0-kmod-4.16.g20200221 DRM modules for the linuxkpi-based KMS
components

My drivers is patched to support CPU: Intel(R) Core(TM) i7-9700 Intel Kaby Lake
i just add the line INTEL_VGA_DEVICE(0x3E98, info), /* SRV GT2 */ in file
i915_pciids.h


=> boot

Sep 26 00:17:25 flash2 kernel: hdacc2: <Intel Kaby Lake HDA CODEC> at cad 2 on
hdac1
Sep 26 00:17:25 flash2 kernel: hdaa2: <Intel Kaby Lake Audio Function Group> at
nid 1 on hdacc2

=> audio over DisplayPort is OK.

=> off/on screen => no audio on DisplayPort (screen speaker)
Sep 26 02:49:44 flash2 kernel: hdacc2: Unexpected unsolicited response with tag
63: ffffffff
Sep 26 02:49:45 flash2 kernel: hdacc2: Unexpected unsolicited response with tag
63: ffffffff

=> reboot => audio over DisplayPort is OK.

=> xset dpms force suspend => same result no audio on DisplayPort
Sep 26 03:18:40 flash2 kernel: hdacc2: Unexpected unsolicited response with tag
63: ffffffff


Each time i got: " hdacc2: Unexpected unsolicited response with tag 63:
ffffffff " the audio
become unsuable from screen connected by DisplayPort. (43" IIAYMA ProLite
X4372UHSU).

The audio from rear jack connector still usable (tested with headphone), 
but as my real loud speaker are in screen... over DisplayPort.

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