These types of errors have been present for a few years now and occur when running the command:
sudo update-initramfs -u
These errors indicate that there are missing firmware and refer to Intel microarchitectures such as:
Sky Lake, Broxton, Kaby Lake, Comet Lake, Ice Lake, Elkhart Lake, Tiger Lake, Gemini Lake, Alder Lake, Arc Alchemist.
To solve the problem on Debian, SysLinuxOS, and other distros, simply download my bash script from GitHub, which will download all the .bin firmware, compare them with those already present, and then copy only the missing ones to /lib/firmware/i915.
To use fixi915.sh, run the following commands:
$ git clone https://github.com/fconidi/fix-firmware-i915.git
$ cd fix-firmware-i915/
$ chmod +x fixi915.sh
Fix error Possible missing firmware /lib/firmware/i915