daliansky/XiaoMi-Pro-Hackintosh

FBEnableDynamicCDCLK causes black screen when wake up from hibernate mode 25

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#406 opened on Jun 16, 2020

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GraphicsSleep & Hibernationhelp wanted

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Description

Bootloader: OpenCore v0.5.9 macOS Version: 10.15.5

Start from Release v1.3.8, we add framebuffer-flag property to support certain features on ig-platform-id: 0x591C0005, for example, support hidpi resolution higher than 1440x810.

However, after some tests, I noticed that the FBEnableDynamicCDCLK flag will break wake up from hibernate mode 25. Workarounds are to close the lid and reopen it, or set hibernate mode to 3 or 0.

A better solution is to disable the FBEnableDynamicCDCLK flag by setting framebuffer-flag to CwfDAA==. But after doing this, the device won't support hidpi resolution larger than 1440x810. It's a trade-off, and for now I find no better solution for this. macOS is known unfriendly to the low-resolution screens like the 1080p screen on XiaoMi-Pro.

Contributor guide

Research direction
Investigate the framebuffer flag property and its effect on hibernate mode. Compare settings with and without FBEnableDynamicCDCLK. Consider alternative flags or patches to support hiDPI without breaking wake.
Tech stack
None
Domain
operating systems
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
OpenCoremacOS
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20