FireWolf Pl.

A Place of Freedom

@FireWolf1 week 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

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.

Read More →

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

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.

Read More →

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

@FireWolf2 years ago

10/3
19:58
macOS Mojave

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

Hi folks! Long time no see.

Finally, I have some time to write this post…

>> Introduction

So recently I was working on installing macOS Mojave on my laptop.
It is equipped with a Core i7 8750H processor and a gorgeous 4K display.

As usual, the first thing right after the installation is to make the integrated graphics card working.

Some of you may have already known that DVMT pre-allocated memory is an “annoying” issue on non-Apple laptop, because Apple has raised the limit as of Broadwell.
(Read the post I published three years ago if you want to know more about this issue.)

Thankfully, the DVMT pre-allocated memory is set to 64 MB by default in BIOS.
This looks reasonable to me since 32 MB DVMT is not enough to power the builtin 4K display.
Besides, I needed to patch the `CoreDisplay` framework to unlock the pixel clock limitation.
So I thought this should be relatively easy, but it turned out that I was “too young and native”.

Read More →

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