Color banding with Dell G7

[vinhtq115]

You should inject minimal properties, as is done in the guide plists:
https://www.tonymacx86.com/threads/guide-booting-the-os-x-installer-on-laptops-with-clover.148093/

Even with minimal, it still has color banding after injecting EDID.

 

[RehabMan]

Even with minimal, it still has color banding after injecting EDID.

Your ioreg proves EDID not injected:

Reason: No AAPL00,override-no-connect entry in config.plist/Devices/Properties/PciRoot(0)/Pci(2,0).

 

[vinhtq115]

Your ioreg proves EDID not injected:
View attachment 371731

Reason: No AAPL00,override-no-connect entry in config.plist/Devices/Properties/PciRoot(0)/Pci(2,0).

So injecting EDID in Clover configurator/Graphics doesn’t work?
Also, what do I need to write in the value for key AAPL00,override-no-connect?

 

[RehabMan]

So injecting EDID in Clover configurator/Graphics doesn’t work?

It works only if the property is listed in Devices/Properties.
Just copy the entry from the guide plist and uncomment it (remove leading #).

 

[vinhtq115]

It works only if the property is listed in Devices/Properties.
Just copy the entry from the guide plist and uncomment it (remove leading #).

Okay. I did it but still got color banding. AAPL00,override-no-connect now shows up in IOREG.

 

[RehabMan]

Okay. I did it but still got color banding. AAPL00,override-no-connect now shows up in IOREG.

Experiment with different EDID patching, different ig-platform-id values.

Note: You failed to implement backlight control correctly...

 

[vinhtq115]

Experiment with different EDID patching, different ig-platform-id values.

Note: You failed to implement backlight control correctly...

I tried all EDID and none of them worked. I used FixEDID to generate override folder and copied them to /System/Library/Displays/Overrides, rebooted but none one them fixed color banding. I also tried different ig-platform-id values but still, none worked.
About backlight control, I got that using SSDT-BRT6.aml (brightness control keys work fine) in ACPI/patched so I guess it's unnecessary.

 

[RehabMan]

I tried all EDID and none of them worked.

My suggestion is more along the lines of understanding EDID and doing your own patching.
There is an EDID article on wikipedia.

About backlight control, I got that using SSDT-BRT6.aml (brightness control keys work fine) in ACPI/patched so I guess it's unnecessary.

The SSDT-BRT6.aml is related to brightness keys, not brightness control.

 

[vinhtq115]

The SSDT-BRT6.aml is related to brightness keys, not brightness control.

Is it correct now?

 

[RehabMan]

Is it correct now?

No. You have two PNLF devices in ioreg.