NUC on Linux

NIC driver

NUC6CAYH has issues with the regular kernel driver. Install the DKMS driver for the NIC:

sudo apt install r8168-dkms
Backing up initrd.img-5.10.0-9-amd64 to /boot/initrd.img-5.10.0-9-amd64.old-dkms
Making new initrd.img-5.10.0-9-amd64
(If next boot fails, revert to initrd.img-5.10.0-9-amd64.old-dkms image)

Microcode updates

Make sure you have non-free sources enabled first.

deb bullseye main contrib non-free
deb bullseye-security main contrib non-free
deb bullseye-updates main contrib non-free

Then install the microcode update package:

apt install intel-microcode

Then, reboot the host.

Integrated LED control

In the BIOS, all LEDs must be set to "SW Control".

Then, the kernel driver can be installed.

Acpi kernel driver

git clone
cd intel_nuc_led

Build the dpkg to install:

sudo make dkms-deb

Then install the generated package:

sudo dpkg -i /var/lib/dkms/intel-nuc-led/1.0/deb/intel-nuc-led-dkms_1.0_all.deb

The module will need to be enabled:

sudo modprobe nuc_led

It should also be loaded at bootup time:

echo "nuc_led" | sudo tee -a /etc/modules-load.d/nuc.conf

LED Control

The LEDs can be controlled by the device file /proc/acpi/nuc_led

cat /proc/acpi/nuc_led 

Power LED Brightness: 100%
Power LED Blink/Fade: Always On (0x04)
Power LED Color: Blue (0x01)

Ring LED Brightness: 20%
Ring LED Blink/Fade: Always On (0x04)
Ring LED Color: Green (0x06)

It can be changed by sending data into that pseudo file, for example setting the ring to Green:

echo 'ring,20,none,blue' | sudo tee /proc/acpi/nuc_led

This can be used in scripts to indicate server problems visually:


echo 'ring,20,none,green' > /proc/acpi/nuc_led


echo 'ring,20,none,yellow' > /proc/acpi/nuc_led


echo 'ring,50,none,red' > /proc/acpi/nuc_led


echo 'ring,50,blink_medium,red' > /proc/acpi/nuc_led

Example: if a backup job fails, flag a warning on the system:

0 0 * * *   root   /opt/scripts/ || /opt/nuc/