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@FireWolf3 months ago

10/16
22:47
macOS Catalina

Coffee Lake Intel UHD Graphics 630 on macOS Catalina: The ultimate solution to the kernel panic due to division by zero in the framebuffer driver

FireWolf Written No Reply 8,155 views

It has been two years since I identified the maximum link rate issue on my laptop.
Now it’s time for me to post the ultimate solution and conclude this series.
If this page looks strange due to font or layout issues, you could find a pretty-printed version at here.

>> Recap of the story

Previously, we have found that the maximum link rate reported by the builtin display is zero and hence the field used as a divider is left zeroed. We have provided a solution to the kernel panic by injecting a valid link rate value via WhateverGreen. However, users are still required to have prior knowledge of a link rate that works for their builtin display. As a result, it is not a perfect solution, and ideally the graphics driver should be able to find a valid value behind the scene.

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Coffee Lake Intel UHD Graphics 630 on macOS Catalina: The ultimate solution to the kernel panic due to division by zero in the framebuffer driver

@FireWolf2 years ago

11/10
23:28
macOS Mojave

Coffee Lake Intel UHD Graphics 630 on macOS Mojave: A nearly ultimate solution to the kernel panic due to division by zero in the framebuffer driver

FireWolf Written 5 Reply 86,009 views

Hi folks! Times goes fast. I have some new findings to share with you. Now it’s time to write a new post.

If this page looks strange due to font or layout issues, you can find a pretty-printed GitBook version at here.

>> Introduction

Nowadays, it might not be easy to make the integrated graphics card, namely Intel UHD Graphics 630, fully work on Apple’s latest macOS Mojave without any issues on a Coffee Lake-based laptop. In addition to the minimum requirement of DVMT pre-allocated memory that I identified three years ago, some built-in displays may not report valid values of certain capabilities, resulting in the graphics driver failing to verify those values and reporting a fatal error by triggering a kernel panic.

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Coffee Lake Intel UHD Graphics 630 on macOS Mojave: A nearly ultimate solution to the kernel panic due to division by zero in the framebuffer driver