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[BUG] Black screen 3 minutes after booting, CoffeeLake UHD 630

Joined
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Asus TUF FX504GE (Clover)
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ACPI names determine which kexts load (for example, without GFX0->IGPU rename, no IGPU PM kexts loaded).




What do you mean by "except at boot"?
The problem is that these work in reverse too. If I disabled something right now then a very high chance laptop will boot without issue. Now after some reboots the problem comes again. Now when you go and enable that thing and boot the macjhine will highly likely boot without issue. both enabling/disabling something can make it work:think:.

What do you mean by "except at boot"?
We have the issue of no backlight during boot na.
 

RehabMan

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The problem is that these work in reverse too. If I disabled something right now then a very high chance laptop will boot without issue. Now after some reboots the problem comes again. Now when you go and enable that thing and boot the macjhine will highly likely boot without issue. both enabling/disabling something can make it work:think:.

Some kind of kernel cache/timing related problem.

We have the issue of no backlight during boot na.

You're referring to the 3 minute black screen issue, right?

Someone needs to investigate what IGPU registers change at that transition. Requires someone knowledgeable enough (and who has the hardware in front of them) to modify a kext like IntelBacklight.kext or AppleIntelInfo.kext to dump key IGPU registers on a timer, in order to see what is changing. Then whatever needs initialization can be done in SSDT-PNLF.aml.
 

RehabMan

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And you have confirmed it is a backlight issue?
That is... you can see an image if you shine a bright light onto the screen during that 3 min window?
 
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And you have confirmed it is a backlight issue?
That is... you can see an image if you shine a bright light onto the screen during that 3 min window?
Yes. That was the first thing I did after I came to know that there exists a thing such as backlight.:p
 

RehabMan

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Yes. That was the first thing I did after I came to know that there exists a thing such as backlight.:p
That’s good as it limits the scope of the problem significantly. Simple matter of determining what needs changing in SSDT-PNLF as I suggested earlier.
 
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On a G3 Dell Laptop with i5-8300H + UHD 630 Integrated [and disabled 1050ti] (see bio) -- same exact issue.

3 minutes of backlight absent, then, boom - it's perfect; Full hardware acceleration, etc, just takes a while.
 
Joined
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Asus TUF FX504GE (Clover)
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On a G3 Dell Laptop with i5-8300H + UHD 630 Integrated [and disabled 1050ti] (see bio) -- same exact issue.

3 minutes of backlight absent, then, boom - it's perfect; Full hardware acceleration, etc, just takes a while.
8750h and 8300h both have this problem. hmm.... no wonder if someone with 8950hk comes tomorrow and says that he has same problem.
 

RehabMan

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8750h and 8300h both have this problem. hmm.... no wonder if someone with 8950hk comes tomorrow and says that he has same problem.

Hopefully someone with the hardware and skills will start to work on what I mention in #76.
 
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Update: I have patched DSDT to enable my brighness keys to change brighness. Brighness keys work fantastic after the backlight comes on.
I shone a flashlight and checked if they could alter the backlight situation but to my disappointment they did not. The brightness keys do work, the brightness logo comes on the screen the levels change(I am seeing this using flashlight) and I find my screen as dim or bright I changed it to after 3 minutes or after i sleep=>wake it. I think it means that something is blocking the backlight from coming on. I hope it narrows down the scope more.
 
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