I was looking for a way to be able to control my case fans with software (not from bios) and I saw that for my motherboard I have to use the nct6687d kernel module: https://github.com/Fred78290/nct6687d. This is included in the akmods module but since ublue deprecated the sway atomic image I switched to

quay.io/fedora-ostree-desktops/sway-atomic

, and in the docs it says the akmods module is only supported on ublue base images. I'm a bit lost here, I've never done anything with kernel modules, if I could get any example I could modify to make the kernel module work in my image it would really help me. This is my image: https://github.com/obispobruno/ublue

message has been deleted

I believe it's because ublue pins the kernel version for their images and for akmods builds

Just running a script in the recipe that builds and installs like in the readme should work? something like:

bash
#!/usr/bin/env bash
git clone https://github.com/Fred78290/nct6687d
cd nct6687d
make akmod

sorry if the question is too basic, as I said I'm a bit lost with kernel mods

Looks like it. You'll probably want to also delete the repo from your image in the same script so that its remnants aren't in your final image

ok, thanks! I will try

Do you use secure boot?

I don't

Nope, actually that makes your process way easier

awesome

If you used secure boot, you would have to sign the kernel and the module too

sounds like a hassle, at least for my threat model

Ah it's trying to run

sudo dnf install /tmp/files/scripts/nct6687d/.tmp/rpmbuild/RPMS/*/*.rpm

I see

Adding

echo "nct6687" >> /etc/modules

to your script should work

ok, I'll try! thanks again for your patience

Yeah no prob

It's still not loading, and it's also not present on

/lib/modules/6.17.13-200.fc42.x86_64

. Any idea why? it shows as installed with dnf though

Oh, you'll probably need to run the [

initramfs

module](https://blue-build.org/reference/modules/initramfs/) afterwards

I have it at the end of my recipe

hmmm

I saw this non critical errors on the logs:

[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.44 >>> Created symlink '/etc/systemd/system/multi-user.target.wants/akmods.service'
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.44 >>>                                                                             
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.46 [6/8] Installing akmod-nct6687d-0:1.0.1 100% |   1.5 MiB/s |  30.0 KiB |  00m00s
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.46 >>> Running %post scriptlet: akmod-nct6687d-0:1.0.155-git2f40c7e.x86_64         
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.46 >>> Non-critical error in %post scriptlet: akmod-nct6687d-0:1.0.155-git2f40c7e.x
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.46 >>> Scriptlet output:                                                           
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.46 >>> Building /usr/src/akmods/nct6687d-kmod-1.0.155-git2f40c7e.src.rpm for kernel
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.46 >>> ERROR: Not to be used as root; start as user or 'akmodsbuild' instead.      
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.46 >>>                                                                             
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.46 >>> [RPM] %post(akmod-nct6687d-1.0.155-git2f40c7e.x86_64) scriptlet failed, exit
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.46 [7/8] Installing nct6687d-0:1.0.155-git 100% | 136.7 KiB/s | 280.0   B |  00m00s
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.83 [8/8] Installing kmod-nct6687d-0:1.0.15 100% | 339.0   B/s | 124.0   B |  00m00s
[18:42:35 g.i/o/ublue-sway-custom:latest] => #79 39.83 Warning: skipped OpenPGP checks for 3 packages from repository: @commandline
[18:42:36 g.i/o/ublue-sway-custom:latest] => #79 39.83 Complete!

@fiftydinar would you have any ideas?

no idea

https://github.com/obispobruno/ublue/blob/main/files/scripts/nct6687d.sh that worked

bash
#!/usr/bin/env bash

set -euo pipefail

REPO_URL="https://github.com/Fred78290/nct6687d"
WORKDIR="$(mktemp -d)"

cleanup() {
  rm -rf "${WORKDIR}"
}
trap cleanup EXIT

# IMPORTANT:
# - This script runs during the image build, inside a container.
# - `uname -r` would report the GitHub runner kernel, not the kernel shipped in the image.
#   So we derive the target kernel version from the image's /usr/lib/modules instead.
if [[ -d /usr/lib/modules ]]; then
  KVER="$(ls -1 /usr/lib/modules | sort -V | tail -n1)"
else
  echo "ERROR: /usr/lib/modules not found; cannot determine target kernel version" >&2
  exit 1
fi

dnf -y install \
  gcc \
  git \
  kmod \
  make \
  elfutils-libelf-devel \
  "kernel-devel-${KVER}" \
  kernel-core

cd "${WORKDIR}"
git clone --depth=1 "${REPO_URL}" nct6687d
cd nct6687d

# Build against the kernel shipped in the image (KVER), not the build host kernel.
make -C "/usr/lib/modules/${KVER}/build" M="$PWD" modules

KO_SRC="$(find . -maxdepth 2 -type f -name '*.ko' | head -n1 || true)"
if [[ -z "${KO_SRC}" ]]; then
  echo "ERROR: build succeeded but no .ko file was produced" >&2
  exit 1
fi

KO_DEST="/usr/lib/modules/${KVER}/extra/$(basename "${KO_SRC}")"
install -D -m 0644 "${KO_SRC}" "${KO_DEST}"

depmod -a "${KVER}"

# Ensure the module is loaded on boot (Fedora uses systemd-modules-load, not /etc/modules).
MODNAME="$(modinfo -F name "${KO_DEST}" 2>/dev/null || true)"
if [[ -n "${MODNAME}" ]]; then
  install -D -m 0644 /dev/stdin "/usr/lib/modules-load.d/${MODNAME}.conf" <<<"${MODNAME}"
fi