Status for sound on Dell Chromebook 3120.  On Ubuntu 22.04.2 (kernel

1. alsa-ucm-conf now seems to include the required UCM2 files.  Hurrah!
2. you also need the firmware-sof-signed package, which you have to enable the 
"restricted" apt repository to get.  Some people enable "restricted" already, 
when they install Ubuntu.
3. after a few minutes continuous playback the sound breaks (continuous beep).  
This is fixed by adding the module/boot option snd_sof.sof_debug=1, as 
described here:

Secondly, this system is affected by the same "after setting
snd_intel_dspcfg.dsp_driver=2 the Sound is Pitched down and too slow".

NOTICE: Upstream has suggested that future kernels will effectively
default to "snd_intel_dspcfg.dsp_driver=2" on this hardware.  I.e. the
default would change from SOF to SST.  If you have this "pitched down"
problem, my only solution is to change back using the boot/module option

** Bug watch added: #5437

** Bug watch added: #3868

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  [SRU] No sound from internal card chtmax98090 (missing UCM2 files in

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