Q:

Ubuntu 18.04 - Lenovo Thinkpad Carbon sound card not recognized since firmware update

I recently updated firmware on my Thinkpad Carbon X1 (last gen, 7th I guess) and since (I'm not sure it is the cause of my problem, but it happens simultaneously), I only have a "dummy device" in sound configuration panel on Ubuntu 18.04. 
I tried a lot of stuff suggested around the web and still, the result of aplay -l is always no sound card detected. 
The output of lspci -nnk | grep -A2 Audio is :
Audio device [0403]: Intel Corporation Device [8086:9dc8] (rev 11)
    Subsystem: Lenovo Device [17aa:2292]
    Kernel driver in use: snd_soc_skl

Any suggestion how to fix this ? 

A:

Thanks to all of you that answered and commented my question.  While waiting for an answer here, I found someone on the web with the same problem that was advised to go and look here : https://bugs.launchpad.net/ubuntu/+source/linux-oem-osp1/+bug/1864061/comments/3.  The two steps proposed there solved the issue :

add options snd-hda-intel dmic_detect=0 in the configuration file /etc/modprobe.d/alsa-base.conf
add blacklist snd_soc_skl in the config file /etc/modprobe.d/blacklist.conf

As this fixed my issue, I do not know if other solutions work as well, but I'm sure they do :).  Thanks again!