HDMI Audio screwed up w/ recent kernels

[Alex Deucher]

On Sat, Dec 31, 2016 at 2:55 AM, James Cloos <cloos at jhcloos.com> wrote:
>>>>>> "AD" == Alex Deucher <alexdeucher at gmail.com> writes:
>
> AD> That option is just a carry over from when the amdgpu was copied from
> AD> radeon.  There is some code for older asics left over from when the
> AD> code was originally ported from radeon.  If you want hdmi audio
> AD> support you need to use the new dc modesetting code we are working on:
> AD> https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-4.7
>
> AD> As for radeon, a bisection would help.  If both drivers worked before
> AD> and now both have issues, I'd suggest looking at the hda audio driver.
>
> All I know is that radeon audio worked fine in 3.x and stopped working
> in 4.x  Where stopped working means fairly recognizable audio which
> sounds mixed with white noise.
>
> I doubt I can bisect.  The screen it uses is in almost constant use....
>
> In order for the fb to be there from boot, the firmware is all compiled
> into the kernels via CONFIG_EXTRA_FIRMWARE.
>
> Given that, with 4.9, the audio has exactly the same problem with amdgpu
> as with radeon, I suspect the actual problem is in the firmware.  If so,
> and since I do not have whatever firmware files were installed back when
> I compiled the 3. kernels, I doubt bisecting the kernel would help.

The GPU firmware is not involved in display or audio at all.

Alex