DP audio does not work

[jcwtime]

System: high sierra 10.13.5
Model: Dell XPS 8900 R17N8B
CPU: Intel i7 6700
Motherboard: DELL 0XJ8C4
Memory: SK Hynix DDR4 2133 16G
Hard Disk: Crucial MX300 120G
Graphics: inno3d GTX 1050TI（dvi x1,dp x1,hdmi x1）
Sound Card: Realtek ALC899
WIFI & Bluetooth: DW1560
Network card: Intel I219-V

Clover:4542
Fakesmc: 6.26-344-g1cf53906.1787
NvidiaGraphicsFixup: 1.2.7
Lilu: 1.2.3

Boot using dp cable, can work normally, multiple hot plug using hdmi no signal, hot plug back dp cable normal (sometimes need 2 hot plug), but no dp audio information.

If you use the hdmi cable to boot, and then hot swap the dp, there will be dp audio information, and the dp audio will work normally. If you hot-plug again, the audio information disappears.

Boot using hdmi cable, work, hot plug dp show normal (sometimes need 2 times hot swap), hot swap using hdmi cable no signal, hot plug dp cable is usually working.

How to solve hot plug hdmi, 90% are no signal?
How to solve DP audio?

 

[P1LGRIM]

For assistance with Audio you should post in the Audio forum.
Read the 'sticky' guides first and be sure to comply with the Problem Reporting instructions or you will not get any help.

 

[toleda]

AppleHDA HDMI Audio/Post #1/Notes/Nvidia