Thank you for giving me this info. I have uploaded a newer version of the Ubuntu MATE image with these changes in mind. I'm not sure of how to enable the extra parameters you gave me, but at least you encouraged me to get audio working again.
To get sound working again for existing images, edit the file at /etc/modules and add to this file:
- Kernel version upgraded to 5.14.0-rc1.
- Most extra packages for the Raspberry Pi family of computers have been removed, including the kernels.
- The PPA at https://launchpad.net/~grate-driver/+archive/ubuntu/ppa is pre-configured to be accessed. Most packages from this repository, including the opentegra driver, come preinstalled. They currently are enough to get 2D acceleration working, but not for 3D acceleration.
- Except for what has been mentioned above, any packages shipped may have to be updated once an internet connection is established.
snd_soc_tegra20_i2s snd_soc_tegra_pcm snd_soc_tegra_wm8903 snd_soc_wm8903