Hifiberry DAC+ ADC Pro not working well with latest ubuntu groovy linux-firmware-raspi2

I have a HifiBerry DAC+ ADC Pro on a raspberry pi 4, that worked fine until I updated Ubuntu this afternoon. Then it did not work well. Found the cause to be the linux-firmware-raspi2 upgrade. Filed a bug for ubuntu at https://bugs.launchpad.net/ubuntu/+source/linux-firmware-raspi2/+bug/1916409 .
I could still use alsaloop with no parameters, but sometimes with some odd ticking sound issues, and sort of use jack with 512 sample buffers, 48KHz, but it failed to connect Jack clients with smaller buffers.

I downgraded to the previous version and everything worked very well again. Not sure if it's a bug for ubuntu or for here, but probably good to know :)


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