Bug#867548: Available for Additional Testing

[Mike Fuller]

I would like to confirm this bug exists on several machines tested with
various AMD video card HDMI audio devices in the GCN 1.0 hardware era.
Glitches do not appear to be present using onboard Intel HDMI out. I
have an Nvidia card I can test if someone needs it, but the issue
appears to be AMD specific. Important to note is on the same test
machines loaded with kernel firmware directly from kernel.org (as the
Debian firmware packages are missing modules):

CentOS 7.5 DOES exhibit this same error
Ubuntu 16.04 LTS DOES exhibit this same error
Ubuntu 18.04 LTS DOES NOT exhibit the same errors, playback is error free.

I have four test machines not being used. All HDMI cables and hardware
has been confirmed known working good with Ubuntu 18.04 and Windows 10
Pro for glitch free playback.

There is something "fixed" in Ubuntu 18.04 LTS. I would be happy to test
several hardware configurations to find the root of the problem
(pulseaudio, kernel config, kernel compile, driver, etc.) so we can see
if this can be patched. I've tried several fixes on various wikis (arch,
ubuntu, debian) to no avail.

Thanks.
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