HDMI Audio screwed up w/ recent kernels

[Daniel Vetter]

On Thu, Dec 22, 2016 at 07:49:57PM -0500, James Cloos wrote:
> 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.

amdgpu doesn't yet support hdmi audio. No idea about what broke for
radeon, bisecting is probably going to be the most effective way forward
(since 3.19->4.0 is so long ago no one will remember what happened back
then).
-Daniel

> 
> -JimC
> -- 
> James Cloos <cloos at jhcloos.com>         OpenPGP: 0x997A9F17ED7DAEA6
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch