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<< Solved >> HDMI not working on Intel UHD Graphics 620 on Whiskey Lake CPU

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thanhdz167 said:
So is there a way to make my adapter work? I tried with MacBook Air Early 2015 running macOS High Sierra and it works
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best to try a straight through HDMI cable
 
Feartech said:
test with a proper cable/monitor
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Yeah and I just found out: My monitor supports up to 1920x1080, but it's always 1366x768 by default. When I tested it on a TV with a direct HDMI cable and the same HDMI to VGA adapter but on a 4K resolution monitor it worked perfectly. Is the problem in the wrong resolution?
 
thanhdz167 said:
Yeah and I just found out: My monitor supports up to 1920x1080, but it's always 1366x768 by default. When I tested it on a TV with a direct HDMI cable and the same HDMI to VGA adapter but on a 4K resolution monitor it worked perfectly. Is the problem in the wrong resolution?
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maybe...

in macOS, display properties you can change the screen resolution

so you have a 4k TV, when you plug a hdmi cable direct from TV to your Laptop, does that work?
 
Feartech said:
maybe...

in macOS, display properties you can change the screen resolution

so you have a 4k TV, when you plug a hdmi cable direct from TV to your Laptop, does that work?
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When I plug HDMI directly from Laptop to HDMI, it works at the highest resolution i.e. 4K
 
thanhdz167 said:
When I plug HDMI directly from Laptop to HDMI, it works at the highest resolution i.e. 4K
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that is good as that works ok

looks like you have one of the vga-hdmi adaptors that is not supported, also keep in mind that Apple has not used VGA for many many years
 
Feartech said:
that is good as that works ok

looks like you have one of the vga-hdmi adaptors that is not supported, also keep in mind that Apple has not used VGA for many many years
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Great, thanks for the answer, I think I'll buy a new adapter

But I still wonder why when I set it up properly, in Hackintool there is only one Internal port, however when I try to access Hackintool and try other Intel Generations with different platform IDs, some of them it's very weird: When I try to access Platform ID, the numbers in the table are: Index = 0, BusID = 0x0, Pipe = 0 , Type = Dummy, Flags = 0x00000040 then all ports are blue i.e. Internal?

After all, what happened behind the scenes?
 
thanhdz167 said:
Great, thanks for the answer, I think I'll buy a new adapter

But I still wonder why when I set it up properly, in Hackintool there is only one Internal port, however when I try to access Hackintool and try other Intel Generations with different platform IDs, some of them it's very weird: When I try to access Platform ID, the numbers in the table are: Index = 0, BusID = 0x0, Pipe = 0 , Type = Dummy, Flags = 0x00000040 then all ports are blue i.e. Internal?

After all, what happened behind the scenes?
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not sure what you are asking as you know your adaptor is not compatible
 
Feartech said:
not sure what you are asking as you know your adaptor is not compatible
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I mean: When I go to hackintool to try other Platform IDs but with Index = 0, BusID = 0x0, Pipe = 0 , Type = Dummy, Flags = 0x00000040 then all ports are green i.e. Internal. And if I set it up correctly, only one port is marked as Internal.

What really happened? What is the Dummy gate type actually for? And with Index = 0, BusID = 0x0, Pipe = 0 , Type = Dummy, Flags = 0x00000040 it's completely different from the correct setup for my Laptop, it shouldn't be marked as Internal, so why is it marked? What are these values so special that they are considered Internal?
 
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