At the moment I have the same problem after I changed my motherboard with the new Asus Z690 Hero, the video is Asus Strix 3080ti, the monitor is Asus PG32uq 4k. The monitor is connected to the display port as before.
I had this problem with the same monitor, the same video card, but with an Asrock motherboard. After updating the monitor, the problem with the Asrok bottom disappeared!
Now after replacing the computer the problem is there. It doesn't load my motherboard logo. It wakes up super slow (monitor).
I wrote to Asus support. From there I was told that they did not understand what my problem was and to do updates on the BIOS, monitor, video card drivers and so on. They made me angry! I think they know very well what the problem is but .....
Friends, does anyone know how to fix the problem
Thank you !