On macOS Tahoe beta 1–8 observe occasional back-light pulsing on the internal display

[hrx114514x]

macOS Version

26.0

What is the precise OS version on which the bug is occurring?

26.0

What is your CPU's model?

amd r5 5500u

Describe the unexpected behaviour in detail.

When HiDPI is enabled, the built-in eDP panel intermittently shows very thin black horizontal lines. They disappear as soon as I move the cursor—sometimes seeming to “follow” it—and then re-appear at random moments. (on Tahoe/Sequoia)And the fresh rate became weired.Rolling back to the previous public build removes the problem, so the regression appears confined to the latest commit.(Old version don’t support tahoe,only tested on sequoia)。On macOS Tahoe beta 1–3 I also observe occasional back-light pulsing on the internal display: brightness rises or falls for roughly two seconds, most often right after boot or immediately after waking from sleep. The same hardware and configuration do not exhibit this behaviour on macOS 15 Sequoia. Moreover,I find the latest build cause kernel panic on Monterey.I use the old version nootedred,and I it boot normally.But I can’t test it again because I have just updated it to sequoia. (My English is not good,some content is ai generated)

https://github.com/user-attachments/assets/efa625ef-d4e3-411c-aa84-7d578125cb74
https://github.com/user-attachments/assets/b31f236c-45b1-457a-84ae-76045828d30d

What should've happened instead?

Tahoe shows no back-light pulsing and no black lines.
Monterey no panic

Attach any logs related to this issue. For example .gpuRestart, .panic, etc files.

No response

Issue Submission Terms

• You have made sure that there are no other reports about this bug.
• You do not use configurator software (e.g. OpenCore Auxiliary Tools, OpenCore Configurator).
• You have made your own EFI according to the ChefKiss Hackintosh Guide.
• You are not using any software that may conflict, including, but not limited to, OpenCore Legacy Patcher, BFixup, WhateverGreen.
• You acknowledge that violation of these terms may result in your issue being closed or your user being blocked from the organisation.

[VisualEhrmanntraut]

the latest commit does not have any functional changes whatsoever

[hrx114514x]

the latest commit does not have any functional changes whatsoever

Today I performed a clean install of Tahoe and noticed the previously reported issue is not gone.The problem is randomly appeared and I'm not confirm how it happens.I can’t retest the Monterey kernel panic right now, but I distinctly remember the panic log contained the word “NootedRed.” After switching to an older 2024 build of NootedRed, the panic disappeared.

One thing I’m certain of: from Tahoe beta 1 through beta 3 the internal display still shows a brief brightness flicker at every boot—about two seconds long without enabling hidpi。 I’m using the same EFI setup, yet Sequoia does not exhibit this behavior at all.

[VisualEhrmanntraut]

sir, this kext merely glues in missing logic to existing drivers. if new unexpected behaviour arises, it's unlikely to be a bug with this kext, but with Apple's software

[VisualEhrmanntraut]

and is your display OLED?

[hrx114514x]

and is your display OLED?

No，it‘s lcd

[VisualEhrmanntraut]

please note that Tahoe is a beta and has bugs that may not be related to my software. please retest with Tahoe beta 4/public beta

[hrx114514x]

please note that Tahoe is a beta and has bugs that may not be related to my software. please retest with Tahoe beta 4/public beta

I've test it from beta 1 to beta 4.All the same problem.Only Tahoe system occurs

[hrx114514x]

So weird. beta 5 same issue.Luckily it does not affect normal use