Comment 34 for bug 1834771

The audio maintainer provided a testing patch, I just built two kernels with this patch, one is 4.15 kernel, the other is 5.0 kernel.

Please install them or one of them, test the hdmi audio, no matter it fixes the issue or not, please upload the dmesg to the launchpad since I put some debugging message in those kernels.

Please test and feedback your testing result and upload the dmesg.

thx.

https://people.canonical.com/~hwang4/hdmiaudio-test/

install the linux-modules first, then linux-image, last please install the linux-module-extra.