Sound not working after ASUS Zenbook keyboard replacement

I just finished replacing my keyboard, and everything seems in good working order except that I no longer can play sound out of the speakers or the headphone jack. I am running Ubuntu 18.04 on an ASUS Zenbook UX330U (a model that unfortunately doesn’t seem to have much documentation relative to other very similar models — what the difference is between the many Zenbook models is often unclear).

Diagnostics

cat /proc/asound/cards

0 [PCH            ]: HDA-Intel - HDA Intel PCH
                     HDA Intel PCH at 0xef128000 irq 129

My understanding is that this card refers to the HDMI port; in particular if I manually edit

/etc/modprobe.d/alsa-base.conf

to include

options snd-hda-intel probe_mask=1 model=generic

, HDMI Display Port replaces “Dummy Output” in the Sound Settings. Furthemore

alsamixer

displays the chip associated with this card as Intel Kabylake HDMI.

It seems to me from this that the laptop is detecting the HDMI hardware but not the regular sound card, which I assume is separate (probably I should be seeing Realtek somewhere in the configs/apps/device files).

The simplest explanation since nothing about the OS or software has changed is that something got disconnected — whether it is still disconnected or whether it is now connected but the OS responded by conveniently forgetting how to detect the sound card is unclear.

Here is an annotated picture of my laptop’s internals. I’ve outlined what I think is the sound card chip (it bears the Realtek logo) and I’ve labeled the headphone jack and the speakers. All of this lies on the small board which also handles WiFi. I believe the small board communicates with the main board via that copper colored ribbon) The WiFi is working so the small board is connected to the main board.

Block Image

At one point this small board was not connected properly. When I powered up the laptop the WiFi wasn’t working. Therefore it is possible that the OS lost track of the sound card during that time and now that everything is connected properly, I just need to coerce the OS to recognize the sound card again.

Attempted Solutions

As noted, I tried editing my

/etc/modprobe.d/alsa-base.conf

similar to recommendations in https://ubuntuforums.org/showthread.php?.... I also tried uninstalling and reinstalling alsa-base and pulseaudio. I don’t believe the issue is a software problem, although it’s not impossible.

Any suggestions of things to check would be most appreciated.

UPDATE: Some additional information — it looks like Bluetooth is no longer working. That said I have no idea where the Bluetooth hardware is, but I wouldn’t be surprised if this was in some way related.

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