Cross posting this from the udrc forum.
Not sure why you are asking your questions in main.

> The tlv320aic3204 driver in the 4.19.42 kernel will NOT work
> reliably. You need to stick with the  4.14.98 kernel until all of Anna's
> patches work their way into the main stream kernel.
>
> From  Anna:
>
>> ALSA changed the API to some of their calls, and the old TLV320 driver
>> doesn’t have the calls.  The new TLV320 driver is in the Raspbian
>> kernel, but it won’t work reliably until I get the final patch pushed
>> in the kernel.
>
> Do NOT do an apt-get upgrade for a while until this gets fixed.
> I have taken apt-get upgrade out of prog_refresh.sh script.

> Where are the sources for udrc-dkms package?

/var/lib/dkms/udrc/1.0.5/source

The udrc/draws tlv320aic32x4 driver is transitioning to a main line
linux kernel driver and will not be built using dkms in future kernels.

/Basil

Christopher AI6KG <ch@...> writes:

> I just reverted back to the latest image.  I will avoid upgrading the
> kernel for now.
>
> Where are the sources for udrc-dkms package?
>
> On Sun, Jun 2, 2019 at 12:23 PM Christopher AI6KG via Groups.Io <ch=
> murgatroid.com@groups.io> wrote:
>
>> #udrc-dkms #dkms #rpi
>>
>> udrc-dkms fails to install after updating system/kernel as seen below.
>>
>> 73 de AI6KG
>>
>>
>> pi@draws:~ $ sudo apt update
>> Hit:1 http://archive.compasslinux.org cedar InRelease
>> Hit:2 http://archive.raspberrypi.org/debian stretch InRelease
>>
>> Get:3 http://raspbian.raspberrypi.org/raspbian stretch InRelease [15.0
>> kB]
>> Fetched 15.0 kB in 2s (5,695 B/s)
>> Reading package lists... Done
>> Building dependency tree
>> Reading state information... Done
>> All packages are up to date.
>> pi@draws:~ $ sudo apt upgrade
>> Reading package lists... Done
>> Building dependency tree
>> Reading state information... Done
>> Calculating upgrade... Done
>> The following package was automatically installed and is no longer
>> required:
>>   dkms
>> Use 'sudo apt autoremove' to remove it.
>> 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
>> pi@draws:~ $ sudo apt install udrc-dkms
>> Reading package lists... Done
>> Building dependency tree
>> Reading state information... Done
>> The following NEW packages will be installed:
>>   udrc-dkms
>> 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
>> Need to get 0 B/27.7 kB of archives.
>> After this operation, 233 kB of additional disk space will be used.
>> (Reading database ... 139013 files and directories currently installed.)
>> Preparing to unpack .../udrc-dkms_1.0.5_armhf.deb ...
>> Leaving 'diversion of /boot/overlays/udrc.dtbo to
>> /usr/share/udrcdkmshack/udrc.dtbo by udrcdkmshack'
>> Leaving 'diversion of /boot/overlays/draws.dtbo to
>> /usr/share/udrcdkmshack/draws.dtbo by udrcdkmshack'
>> Unpacking udrc-dkms (1.0.5) ...
>> dpkg: error processing archive
>> /var/cache/apt/archives/udrc-dkms_1.0.5_armhf.deb (--unpack):
>>  trying to overwrite '/boot/overlays/draws.dtbo', which is also in package
>> raspberrypi-kernel 1.20190517-1
>> Errors were encountered while processing:
>>  /var/cache/apt/archives/udrc-dkms_1.0.5_armhf.deb
>> E: Sub-process /usr/bin/dpkg returned an error code (1)
>> pi@draws:~ $ dpkg -l |grep raspberrypi-kernel
>> ii  raspberrypi-kernel                    1.20190517-1
>>  armhf        Raspberry Pi bootloader
>> ii  raspberrypi-kernel-headers            1.20190517-1
>>  armhf        Header files for the Raspberry Pi Linux kernel