Ryzen 7 5700G bugs with DP and acceleration

[sasdallas]

Describe the bug On the Ryzen 7 5700G, I experience very strange behavior:

DP Issues When I boot up macOS, I cannot have both of my monitors (1 DP and 1 HDMI) plugged into the iGPU, as after gIOLockScreen I just get a black screen with no output (just "No Signal"). If I have my HDMI monitor plugged into the iGPU and my DP monitor plugged into dGPU (unsupported GPU, NVIDIA RTX 3070), the iGPU monitor boots to lock screen, and I can unplug the DP monitor and plug it into iGPU and use macOS.

TL;DR: macOS only shows up if the DP monitor is not plugged in on boot, and DP monitor works only after plugging it after first lock screen.

Acceleration issues VDADecoderChecker shows error -12473, but some graphics acceleration is present (taskbar is slightly transparent and windows move okay).

To Reproduce Steps to reproduce the behavior:

1. Have two monitors, one using HDMI and one using DP.
2. Plug both monitors into iGPU.
3. Profit (or in this case, don't)

Expected behavior I don't have to play stupid games with my GPUs and VDADecoderChecker outputs success.

Screenshots insert black screen

System Information:

• macOS Version: macOS 11.7.10
• CPU: AMD Ryzen 7 5700G
• (Unsupported) dGPU: NVIDIA RTX 3070
  • SMBIOS: iMac20,1

Additional context

• I removed WhateverGreen
• Display freezes up when too much is happening.

[VisualEhrmanntraut]

The VDA stuff is just #28. The DP stuff seems to also be #52. Unfortunately, these issues are very complicated, reposting them won't help us fix them