[Bug 250523] Increasing or decreasing system volume control does nothing in Gnome-3.38

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250523

            Bug ID: 250523
           Summary: Increasing or decreasing system volume control does
                    nothing in Gnome-3.38
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
               URL: https://forums.freebsd.org/threads/configuring-hdmi-au
                    dio-to-work-well-in-gnome-3-38-volume-control-not-work
                    ing-how-can-we-enable-auto-switching-speaker-and-headp
                    hone.77391/
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: mailto1979 at rediffmail.com

Created attachment 218967
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=218967&action=edit
System volume slider does not work, except muting at lowest level

I have recently upgraded Gnome to 3.38 on a FreeBSD-12.1 system. I am using a
DH67CL Intel mainboard with i3-2120 processor and using HDMI output for sound. 

The sound slider on the upper right corner does nothing if I increase or
decrease. However, If I slide it down, the sound mutes. I checked that my
device is a Intel Cougar Point HDMI output and it has a 'Vol' and 'PCM' as
controls listed in mixertui. If I adjust 'PCM', I can increase or decrease
sound volume. So, I believe Gnome's volume control is mapped to 'Vol'. So, in
order to get sound volume control to work, mapping system sound in Gnome to
'PCM' is needed. 

I had also tried adding HDMI device details to /boot/device.hints and it did
not work. Please help to make the sound volume control in Gnome-3.38 work. Let
me know, if any other details needed. 

:~% cat /dev/sndstat

Installed devices:
pcm0: <Realtek ALC892 (Rear Analog 5.1/2.0)> (play/rec) default
pcm1: <Realtek ALC892 (Front Analog)> (play/rec)
pcm2: <Realtek ALC892 (Rear Digital)> (play)
pcm3: <Realtek ALC892 (Rear Digital)> (play)
pcm4: <Intel Cougar Point (HDMI/DP 8ch)> (play)

dmesg:

pcm4: <Intel Cougar Point (HDMI/DP 8ch)> at nid 7 on hdaa1
pcm4: Playback:
pcm4:      Stream cap: 0x00000005 AC3 PCM
pcm4:         PCM cap: 0x001e07f0 16 20 24 32 bits, 32 44 48 88 96 176 192 KHz
pcm4:             DAC: 4
pcm4:
pcm4:     nid=7 [pin: Digital-out (Jack)]
pcm4:       + <- nid=4 [audio output] [src: pcm]
pcm4:
pcm4: Master Volume (OSS: vol): 0/0dB
pcm4:    +- ctl  3 (nid   7 in ):    mute
pcm4:
pcm4: PCM Volume (OSS: pcm): 0/0dB
pcm4:    +- ctl  3 (nid   7 in ):    mute



:~% pciconf -vl
hdac0 at pci0:0:27:0:    class=0x040300 card=0x20038086 chip=0x1c208086 rev=0x05
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '6 Series/C200 Series Chipset Family High Definition Audio
Controller'
    class      = multimedia
    subclass   = HDA

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