[Bug 101900] No HDMI HBR audio on Polaris (no TrueHD, no Atmos, no Neo:X, no HD Master audio) and static noise in sound when LPCM on amdgpu Xorg driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101900

--- Comment #32 from Direx <direx at betriebsdirektor.de> ---
(In reply to Andrew Nelson from comment #31)
> I have been running into the same issue. The problem seems to be that AMDGPU
> is reporting that it supports 7 speakers instead of 8 in the EID. HBR
> formats work with 5.1 encoded audio, but not 7.1. For some reason, the
> driver is configured to subtract 1 from the channel count before passing it
> into the EID. I have removed this and confirmed that 7.1 HBR audio works.

Jackpot, this is it. Just tried your patch and now all audio formats are
working. I can confirm that the following formats can now be played back
correctly on my RX480:

- PCM 2.0
- PCM 5.1
- PCM 7.1
- Dolby Digital at 5.1
- DTS at 5.1
- Dolby TrueHD at 7.1
- DTS HD-MA at 7.1
- Dolby Atmos

Excellent job. Can we please get this patch into drm-fixes, as it is cleary a
bug fix and not a new feature.

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