If you’re using LUKS encryption, you need to run the following in the terminal to make the keyboard work:

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Surface Laptop 3 + Debian: Internal keyboard not working (I²C keyboard not loaded in initramfs).

Fix:

1. Edit: sudo nano /etc/initramfs-tools/modules

2. Add drivers (see below)

3. Run: sudo update-initramfs -u

4. Reboot

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Add to /etc/initramfs-tools/modules:

i2c_designware_core

i2c_designware_platform

i2c_hid

hid_multitouch

intel_lpss_pci

surface_hid

surface_kbd

surface_aggregator

surface_aggregator_registry

surface_aggregator_hub

pinctrl_tigerlake