HDMI Audio screwed up w/ recent kernels

[James Cloos]

I haven't paid as close attention to Xorg issues sine the stroke last
year, and I hadn't needed to reboot the box in the living room in
several months.

When I did need to, I found that hdmi audio was unlistenable.  It
sounded like it was mixed witht white noise.

If I boot vmlinuz-3.19.0 is works fine.  I had compiled 4.1.0 and 4.5.0,
as well as its current default kernel, 4.9.0 (all from Linus' git).  All
of those 4. kernels show the crappy audio.

In 4.9 I then tried switching to amdgpu.  That did not help.

The box has a Kaveri apu (ChipID 0x1313).

Firmware is from linux-firmware.git and is compiled into the kernel via
CONFIG_EXTRA_FIRMWARE.

With radeon the kernel command line has:  radeon.modeset=1 radeon.audio=1
With amdgpu I switched to:  amdgpu.audio=1 amdgpu.exp_hw_support=1

Any thoughs on where to look?

I find it hard to believe that a bug like this could persist for so
long.

-JimC
-- 
James Cloos <cloos at jhcloos.com>         OpenPGP: 0x997A9F17ED7DAEA6