K70 RGB keyboard long boot time fix - https://github.com/ccMSC/ckb/issues/234

k70rgb-boot-fix.sh

#!/bin/bash

if [ "$EUID" -ne 0 ]; then
  echo "Run me with sudo"
  exit
fi

TARGET_KEY="GRUB_CMDLINE_LINUX_DEFAULT"
REPLACEMENT_VALUE="\"elevator=deadline splash quiet usbhid.quirks=0x1b1c:0x1b13:0x20000000\""
CONFIG_FILE="/etc/default/grub"

sed -i "s/\($TARGET_KEY *= *\).*/\1$REPLACEMENT_VALUE/" $CONFIG_FILE
update-grub