I am using an ASUS All Series/X99-A, BIOS 4101 07/10/2019.
The soundcard in question is the Motherboard builtin.
This question seems at first like a repeat of this question for 16.04 but the accepted answer was that kernel 4.10 would fix the issue. However I'm at kernel 5.4.0 and the issue persists.
I have already installed+reinstalled pulseaudio and all the alsa config files. I have already followed many recipes and added all these options (once each) to /etc/modprobe.d/alsa-base.conf:
options snd-hda-intel enable_msi=1 bdl_pos_adj=0,-1
options snd-hda-intel enable_msi=1 model=auto 
options snd-hda-intel model=dell-headset-multi
options snd-hda-intel enable_msi=1 model=auto 
in every possible combination. One combination (forgot which) actually worked for a couple of months but then it suddenly stopped working.
I can see the card in the alsa mixer

but it does not show up in pulseaudio volume control.

What am I doing wrong? What can I possibly try? Should I just take the L at this point?
Thank you!
$ lspci -vv 
...
00:1b.0 Audio device: Intel Corporation C610/X99 series chipset HD Audio Controller (rev 05)
        Subsystem: ASUSTeK Computer Inc. C610/X99 series chipset HD Audio Controller
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 33
        NUMA node: 0
        Region 0: Memory at 383ffff10000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
                Address: 00000000fee08000  Data: 4022
        Capabilities: [70] Express (v1) Root Complex Integrated Endpoint, MSI 00
                DevCap: MaxPayload 128 bytes, PhantFunc 0
                        ExtTag- RBE- FLReset+
                DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
                        RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop- FLReset-
                        MaxPayload 128 bytes, MaxReadReq 128 bytes
                DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend-
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel
$ dmesg | grep 00:1b.0
[    2.306391] pci 0000:00:1b.0: [8086:8d20] type 00 class 0x040300
[    2.306413] pci 0000:00:1b.0: reg 0x10: [mem 0x383ffff10000-0x383ffff13fff 64bit]
[    2.306491] pci 0000:00:1b.0: PME# supported from D0 D3hot D3cold
[    6.460094] input: HDA Intel PCH Front Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input15
[    6.460126] input: HDA Intel PCH Rear Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input16
[    6.460156] input: HDA Intel PCH Line as /devices/pci0000:00/0000:00:1b.0/sound/card0/input17
[    6.460184] input: HDA Intel PCH Line Out Front as /devices/pci0000:00/0000:00:1b.0/sound/card0/input18
[    6.460214] input: HDA Intel PCH Line Out Surround as /devices/pci0000:00/0000:00:1b.0/sound/card0/input19
[    6.460241] input: HDA Intel PCH Line Out CLFE as /devices/pci0000:00/0000:00:1b.0/sound/card0/input20
[    6.460268] input: HDA Intel PCH Front Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input21
$ dmesg | grep snd_hda
[    6.404949] snd_hda_intel 0000:01:00.1: Handle vga_switcheroo audio client
[    6.445157] snd_hda_codec_realtek hdaudioC0D0: ALC1150: SKU not ready 0x00000000
[    6.445660] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC1150: line_outs=3 (0x14/0x15/0x16/0x0/0x0) type:line
[    6.445661] snd_hda_codec_realtek hdaudioC0D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[    6.445662] snd_hda_codec_realtek hdaudioC0D0:    hp_outs=1 (0x1b/0x0/0x0/0x0/0x0)
[    6.445663] snd_hda_codec_realtek hdaudioC0D0:    mono: mono_out=0x0
[    6.445663] snd_hda_codec_realtek hdaudioC0D0:    dig-out=0x11/0x1e
[    6.445664] snd_hda_codec_realtek hdaudioC0D0:    inputs:
[    6.445665] snd_hda_codec_realtek hdaudioC0D0:      Front Mic=0x19
[    6.445666] snd_hda_codec_realtek hdaudioC0D0:      Rear Mic=0x18
[    6.445666] snd_hda_codec_realtek hdaudioC0D0:      Line=0x1a
[   19.176070] snd_hda_codec_hdmi hdaudioC1D0: HDMI: invalid ELD data byte 26
[ 1748.151754] snd_hda_codec_hdmi hdaudioC1D0: HDMI: invalid ELD data byte 4
$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC1150 Analog [ALC1150 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: ALC1150 Digital [ALC1150 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 9: HDMI 3 [HDMI 3]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 10: HDMI 4 [HDMI 4]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 11: HDMI 5 [HDMI 5]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 12: HDMI 6 [HDMI 6]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
