Bug 1759345

Created attachment 1623341 [details]
dmesg.txt

1. Please describe the problem:
Sound card doesn't work out of the box on Fedora 31.
All sound settings only refer to "Dummy output".


2. What is the Version-Release number of the kernel:
kernel-5.3.2-300.fc31.x86_64


3. Did it work previously in Fedora? If so, what kernel version did the issue
   *first* appear?  Old kernels are available for download at
   https://koji.fedoraproject.org/koji/packageinfo?packageID=8 :
Did not work previously.


4. Can you reproduce this issue? If so, please provide the steps to reproduce
   the issue below:
Boot the device, attempt playing a sound.


5. Does this problem occur with the latest Rawhide kernel? To install the
   Rawhide kernel, run ``sudo dnf install fedora-repos-rawhide`` followed by
   ``sudo dnf update --enablerepo=rawhide kernel``:
It still happens with 5.3.4-300


6. Are you running any modules that not shipped with directly Fedora's kernel?:
No


7. Please attach the kernel logs. You can get the complete kernel log
   for a boot with ``journalctl --no-hostname -k > dmesg.txt``. If the
   issue occurred on a previous boot, use the journalctl ``-b`` flag.


Most important thing is that adding two configuration files makes the device work.
These are discovered on linuxmint forum post[1] and later on github gist[2].
There is a bit more information in this repository[3] as well.

Creating the directory /usr/share/alsa/ucm/bytcht-cx2072x/, putting files there and rebooting makes device operational. 
Now, the weird part is that sound works even after removing those two files...
I don't understand what is happening, but I'll gladly provide more information.

Please let me know if there is anything else I can do.

[1] https://forums.linuxmint.com/viewtopic.php?t=294531#p1636594
[2] https://gist.github.com/heikomat/3fe272431b44b580c933bfb901a92257#file-cx2072x_sound_debian-sh-L91
[3] https://github.com/heikomat/linux/tree/cx2072x/cx2072x_fixes_and_manual