20.04 - No sound - only Dummy Output in Settings > Sound

[Chris]

I posted this last Sat however it's not gotten any replies so possibly
it looked too much like the previous thread about not sound so I've
changed the subject line.

Firstly
Dell Optiplex 780 updated firmware and Bios Gnome desktop. Running Live
Session DVD I have sound in headphones and Settings/Sound shows
'Headphones - Build in Audio'. Under settings/sound on the desktop it
shows 'Output Device - Dummy Output', lspci shows:

00:1b.0 Audio device: Intel Corporation 82801JD/DO (ICH10 Family) HD
Audio Controller (rev 02)

Running alsamixer in terminal, nothing is muted. 

Output of aplay -l
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD1984A Analog [AD1984A Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 2: AD1984A Alt Analog [AD1984A Alt
Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Output of lsmod | grep snd
lsmod | grep snd
snd_hrtimer            16384  1
snd_hda_codec_analog    16384  1
snd_hda_codec_generic    81920  1 snd_hda_codec_analog
ledtrig_audio          16384  1 snd_hda_codec_generic
snd_hda_intel          53248  4
snd_intel_dspcfg       24576  1 snd_hda_intel
snd_hda_codec         135168  3
snd_hda_codec_generic,snd_hda_intel,snd_hda_codec_analog
snd_hda_core           90112  4
snd_hda_codec_generic,snd_hda_intel,snd_hda_codec_analog,snd_hda_codec
snd_hwdep              20480  1 snd_hda_codec
snd_pcm               106496  4
snd_hda_intel,snd_hda_codec,snd_hda_core
snd_seq_midi           20480  0
snd_seq_midi_event     16384  1 snd_seq_midi
snd_rawmidi            36864  1 snd_seq_midi
snd_seq                69632  3 snd_seq_midi,snd_seq_midi_event
snd_seq_device         16384  3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer              36864  4 snd_seq,snd_hrtimer,snd_pcm
snd                    90112  17
snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hwdep,snd_hda_intel,sn
d_hda_codec_analog,snd_hda_codec,snd_timer,snd_pcm,snd_rawmidi
soundcore              16384  1 snd

Output of grep snd /etc/modprobe.d/blacklist*
grep snd /etc/modprobe.d/blacklist*
/etc/modprobe.d/blacklist.conf:# snd_intel8x0m can interfere with
snd_intel8x0, doesn't seem to support much
/etc/modprobe.d/blacklist.conf:blacklist snd_intel8x0m
/etc/modprobe.d/blacklist.conf:blacklist snd_aw2
/etc/modprobe.d/blacklist.conf:blacklist snd_pcsp
/etc/modprobe.d/blacklist.conf~:# snd_intel8x0m can interfere with
snd_intel8x0, doesn't seem to support much
/etc/modprobe.d/blacklist.conf~:blacklist snd_intel8x0m
/etc/modprobe.d/blacklist.conf~:blacklist snd_aw2
/etc/modprobe.d/blacklist.conf~:blacklist snd_pcsp
/etc/modprobe.d/blacklist.conf.dpkg-old:# snd_intel8x0m can interfere
with snd_intel8x0, doesn't seem to support much
/etc/modprobe.d/blacklist.conf.dpkg-old:blacklist snd_intel8x0m
/etc/modprobe.d/blacklist.conf.dpkg-old:blacklist snd_aw2
/etc/modprobe.d/blacklist.conf.dpkg-old:blacklist snd_pcsp
/etc/modprobe.d/blacklist-modem.conf:# blacklist snd-atiixp-modem
/etc/modprobe.d/blacklist-modem.conf:# blacklist snd-intel8x0m
/etc/modprobe.d/blacklist-modem.conf:# blacklist snd-via82xx-modem

Output of hwinfo --sound
hwinfo --sound
14: PCI 1b.0: 0403 Audio device                                 
  [Created at pci.386]
  Unique ID: u1Nb.dH6p_cKR519
  SysFS ID: /devices/pci0000:00/0000:00:1b.0
  SysFS BusID: 0000:00:1b.0
  Hardware Class: sound
  Model: "Intel 82801JD/DO (ICH10 Family) HD Audio Controller"
  Vendor: pci 0x8086 "Intel Corporation"
  Device: pci 0x3a6e "82801JD/DO (ICH10 Family) HD Audio Controller"
  SubVendor: pci 0x1028 "Dell"
  SubDevice: pci 0x0420 
  Revision: 0x02
  Driver: "snd_hda_intel"
  Driver Modules: "snd_hda_intel"
  Memory Range: 0xf7adc000-0xf7adffff (rw,non-prefetchable)
  IRQ: 33 (1294193 events)
  Module Alias: "pci:v00008086d00003A6Esv00001028sd00000420bc04sc03i00"
  Driver Info #0:
    Driver Status: snd_hda_intel is active
    Driver Activation Cmd: "modprobe snd_hda_intel"
  Config Status: cfg=new, avail=yes, need=no, active=unknown

I've followed Liams directions here on how to fix the dummy output:

https://www.linuxuprising.com/2018/06/fix-no-sound-dummy-output-issue-in.html

each step in order with a restart in between steps. Even to setting
this
in my /etc/modprobe.d/alsa-base.conf options snd-hda-intel
model=generic when
that didn't work I changed it to auto with still the same effect -
dummy output.


-- 
Chris
31.11972; -97.90167 (Elev. 1092 ft)
09:12:39 up 1 day, 18 min, 1 user, load average: 0.67, 1.01, 1.09
Description:	Ubuntu 20.04.1 LTS, kernel 5.4.0-48-generic