Intel UHD 620 HDMI output is not working

[EliteMacx86]

see if these are ok

EFI is OK. IOReg is corrupt. Use v2.1

 

[pawan2joy]

fresh IOreg file..

 

[EliteMacx86]

fresh IOreg file..

The framebuffers are not patched correctly. There should be only 2 connectors that requires patching. Con0 - the internal display and con1/2 for the HDMI and Type-C display.

Before the external port can work in macOS, can you confirm if this Laptop has any dGPU?

 

[pawan2joy]

no laptop has no dGPU

 

[Max.1974]

Hi @pawan2joy try this EFI without modified anything. Is your EFI but with an OCAT update and modified Plist Device 620 UHD. Just delete yours and copy to your EFI partition. Backup all first, try it with usb pendrive. You not need any boot-args related about your igpu, all is put it on Device Plist Properties. Report back if is possible, and enjoy it.

 

[pawan2joy]

HI Max.. i tried this one but no change, still no output... i get screen message on TV that "video not support"

This one helped but graphics on TV were not 4k or it was like pixelated..




This EFI i downloaded online but if you can help to keep everything i have, just grpahics output works..i tried but wasnt successful.. i think ACPI also needs to be mapped...

(removed Itlwm kext to reduce size of EFI)

 

[pawan2joy]

can you suggest what all i should copy from this EFI to make my HDMI work..

 

[EliteMacx86]

no laptop has no dGPU

Are you sure?

 

[EliteMacx86]

HI Max.. i tried this one but no change, still no output... i get screen message on TV that "video not support"

This one helped but graphics on TV were not 4k or it was like pixelated..


View attachment 8806

This EFI i downloaded online but if you can help to keep everything i have, just grpahics output works..i tried but wasnt successful.. i think ACPI also needs to be mapped...

(removed Itlwm kext to reduce size of EFI)

This is not what @Max.1974 posted.

 

[EliteMacx86]

Hi @pawan2joy try this EFI without modified anything. Is your EFI but with an OCAT update and modified Plist Device 620 UHD. Just delete yours and copy to your EFI partition. Backup all first, try it with usb pendrive. You not need any boot-args related about your igpu, all is put it on Device Plist Properties. Report back if is possible, and enjoy it.

View attachment 8805

An interesting thing i noticed recently is when trying to update one of the ThinkStation (9700). It seems like the Connector0 is replaced by Connector1. For example, till Ventura, the HDMI is Con0 and the DP is Con1. However, in macOS Sequoia, its opposite so it fails to output. Once the connector type were replaced, the display worked from both. Cannot confirm this bug 100% yet, but that's what i've found at least.