Possible missing firmware /lib/firmware/i915/* for module i915

For a general propose, apt-file is your way to solve the Possible missing firmware... warning. e,g:

apt-file search bxt_dmc

firmware-misc-nonfree: /lib/firmware/i915/bxt_dmc_ver1.bin
firmware-misc-nonfree: /lib/firmware/i915/bxt_dmc_ver1_07.bin

the package firmware-misc-nonfree provide the missing firmware.

Installing the firmware-linux package solve the problem because firmware-linux depend on firmware-linux-nonfree depend on firmware-misc-nonfree.

Detailed instructions:

Add non-free to your /etc/apt/sources.list :

deb http://deb.debian.org/debian buster main contrib non-free
deb http://deb.debian.org/debian-security/ buster/updates main contrib non-free
deb http://deb.debian.org/debian buster-updates main contrib non-free

Install apt-file:

sudo apt update
sudo apt install apt-file
sudo apt-file update

Debian: apt-file

It appears the answer was the whole time in front of my eyes.

I have finally found the right package: firmware-linux, which installs all the missing firmware. Install it with:

sudo apt-get install firmware-linux

Those warnings might be gone afterward.

you can download them from here

and copy downloaded files to this path : /lib/firmware/i915/

then update-initramfs -u -k all

(then sudo apt-get update -y)