As reported on the Solus issue tracker and on the Arch forum some Fujitsu laptops apparently require the psmouse module to be loaded in order for the keyboard to be functional. At least the Fujitsu Lifebook T938 model laptop is known to require this.
yenta_socket intel_lpss_pci spi_pxa2xx_platform \
atkbd i8042 firewire-ohci pcmcia hv-vmbus \
virtio virtio_ring virtio_pci pci_hyperv \
- surface_aggregator_registry "=drivers/pcmcia"
+ surface_aggregator_registry psmouse \
+ "=drivers/pcmcia"
if [[ ${DRACUT_ARCH:-$(uname -m)} == arm* || ${DRACUT_ARCH:-$(uname -m)} == aarch64 || ${DRACUT_ARCH:-$(uname -m)} == riscv* ]]; then
# arm/aarch64 specific modules