外接显示器2K，间歇性黑屏1-2秒.External 2K Monitor intermittently blackout 1-2 seconds

[bohenao]

As above and internal screen was glitch sometime which not very often.
I searched and found a lot of same issues but no one has solution.

I used to use Clover 10.15.4 and there is not problem;

I tried to :
1. change cables and change to dock DP port;
2. change monitors;
3. change web browsers;
4. change boot arg to : lilucpu=8 and buffer_id to 00001916, cannot boot.
without any luck.

[bohenao]

Reverse Whatevergreen back to version 1.3.7. Let's see if it works or not.