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Only 2 external HDMI/DP display audio outputs when 3 DPMST audio monitors connected #2798

@kv2019i

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@kv2019i

[ Via @sathya-nujella ]

With 3 DP-MST monitors connected to a TGL system, following error is seen:

[ 191.077924] snd_hda_codec_hdmi ehdaudio0D2: HDMI: pin NID 0xa not registered

This bug occur when there are four displays connected (one can be the eDP panel), and three of them connected to DP-MST hub (and all have audio capability).

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DP-MSTIssues related to DisplayPort Multi-Stream TransportHDAApplies to HD-Audio bus for codec connectionTGLApplies to Tiger Lake platformbugSomething isn't working

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