[FAILURE] Monterey on HP Compaq Elite 8300 All-In-One

[EliteMacx86]

But it's the first time I got 1080p !

With the acceleration on the internal screen?

And maybe there's a path to explore with "mirroring" ? I saw it's disabled on the system info picture.

You can definitely mirror the screen.

About the 2 choices, what's your bet ?

Inject EDID so that at least you can get acceleration on external monitor.

 

[HarFanG]

With the acceleration on the internal screen?

Post #98 : no.

You can definitely mirror the screen.

Everytime mirror was activated, the resolution went to 1280x1024.

Inject EDID so that at least you can get acceleration on external monitor.

My purpose is to only use the internal monitor. If I need to move the "Mac" to another location, it will be more easy without an external monitor, by example.

 

[HarFanG]

I made "some" progress...

First, using a dock, I did a clone of the currently working system, and EFI backup done too.

Still using "-igfxvesa", the clone comes to desktop, 1080p. Nice.
I tried embedded screen backlight controls => they works. Then, I put max brighness.

After that, I did the HQP EDID injection : alas, it's still not recognized (but still works onto 1080p).

And when I remove the "-igfxvesa", the HQP goes black...and can't reach desktop, even connected on a second monitor.

 

[HarFanG]

After many tries, the system went locked up because of a wrong bios parameter.

But I found a way to fix it, so Big Sur is running again. Without embedded screen (HQP) as usual.

 

[HarFanG]

I gave this project up, as it seems the integrated screen is not MacOS compatible.
It only works without graphics acceleration : otherwise, it become totally black, unusable.