[solved]Seconds of black screen after Monterey boots

[lichking]

hi.

I used Olarila's Kaby Lake Desktop Opencore EFI files to boot Monterey beta 10 with iGPU only. 

Every time it got to the login screen, the screen went black for several seconds before back to normal.

It seemed that no video data was transferred through the HDMI cable during the black screen period.

If you've got any idea to fix it, please help me out.

 

[update]

delete agdpmod=pikera

Edited October 18, 2021 by lichking

[MaLd0n]

if u use igpu need change smbios too

[lichking]

19 hours ago, MaLd0n said:

if u use igpu need change smbios too

I tried to change SMBIOS (originally imacpro1,1) to iMac18,1 as advised in OpenCore Installation Guide. But the black screen issue happened again unless I changed the SMBIOS back.

[MaLd0n]

inject properties 59128086 and 59120000 with smbios iMac18,1

[lichking]

14 hours ago, MaLd0n said:

inject properties 59128086 and 59120000 with smbios iMac18,1

I didn't inject any gpu property because

Quote

 

with IGPU enable

a- Enable IntelHDGraphics. Last version of the WhateverGreen Inject properties on the fly. You don't need change nothing, just enable Internal Graphics.

 

if you prefer to inject manually with DeviceProperties, see below

 

and because

59120000 has already been injected in DeviceProperties/PciRoot/Add in your Kaby Lake config.plist as AAPL,ig-platform-id=00001259.

Correct me if I'm wrong. I recall that 59128086 works with Clover and 59120000 with OC. 

Edited October 20, 2021 by lichking

[MaLd0n]

59128086 is device-id no platform-id