[Bug 101900] No HDMI HBR audio on Polaris (no TrueHD, no Atmos, no Neo:X, no HD Master audio)

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Comment # 27 on bug 101900 from
After more tests, i have a small race condition on my systemctl setup which
causes X to be unable to load the "amdgpu" driver and fallbacks on
"modesetting" instead.

In this case, the videocard can't use vdpau anymore, so it's fully software
decoding. Then the sound is playing perfectly.

When X is loading the amdgpu driver, the sound problems are still present. The
video must eat the sound bandwidth or something (?)

Actually on "4.15.0-999-generic #201801102100"


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