Comment 281 for bug 1887190

After several painstaking hours I finally got it working on Manjaro, so I wanted to share my experience for anyone else that is new to patching the kernel like me. This is my first time ever doing so.

I tried and tried to make this work on Ubuntu Budgie 20.10 following the guide by @Baq Domalaq (baq) but I just couldnt get the ubuntu kernel to build. Manjaro on the other hand was fairly painless.

This only works for Manjaro

1. Clone the kernel repo for linux 5.8
# git clone https://gitlab.manjaro.org/packages/core/linux58.git

2. open the repo
# cd ./linux58

3. Download the patch from #179
# wget https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1887190/+attachment/5418465/+files/0303-pinctrl-amd2.patch

4. Edit the PKGBUILD file and add '0303-pinctrl-amd2.patch' after the line that has '0303-pinctrl-amd.patch'

5. Update the checksums
# updpkgsums

6. Build the package. This will take some time. You may be prompted for something about PREMPT. Choose CONFIG_PREEMPT_VOLUNTARY.
# makepkg -s

7. Once it's done, you can install the package.
# makepkg -i

In my case, this broke the nvidia driver so I ended up uninstalling the nonfree driver and using the free driver instead. This can be done with the following commands.

8. Remove nonfree driver. Could also be video-nvidia-455xx
# sudo mhwd -r pci video-nvidia-440xx

9. Install the free driver
# sudo mhwd -i pci video-linux

Also installing the free driver fixed the display brightness issue. Everything seems to be working for me now!

In case anyone runs into any issues, this is the guide I followed to build the kernel. https://leduccc.medium.com/compiling-a-custom-linux-kernel-on-manjaro-f09aa103713f