Hello! I've set up an Ubuntu 20.04 install with the stock ChromeOS kernel (release-r96-14268.B-chromeos-5.4). The sound card is correctly detected (kblda7219max):
aplay -l:
**** List of PLAYBACK Hardware Devices ****
card 0: kblda7219max [kblda7219max], device 0: Audio (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: kblda7219max [kblda7219max], device 4: Hdmi1 (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: kblda7219max [kblda7219max], device 5: Hdmi2 (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: kblda7219max [kblda7219max], device 6: Hdmi3 (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
I am using a completely stock ALSA setup without PulseAudio.
I've also attached my lspci -v, lsmod, and dmesg output: