老筆電X61出現Possible missing firmware...訊息

由於 linux-firmware 套件缺少了i915晶片一些韌體，導致每次更新kernel就會出現下列訊息：

update-initramfs: Generating /boot/initrd.img-5.4.0-84-generic

W: Possible missing firmware /lib/firmware/i915/tgl_dmc_ver2_04.bin for module i915
W: Possible missing firmware /lib/firmware/i915/skl_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/glk_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/icl_guc_33.0.0.bin for module i915

缺韌體問題，就來這個網址下載這一包找找：
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/

果然找到，補到 /lib/firmware/i915/ 內就 ok 了！

ref:

https://askubuntu.com/questions/1131885/help-w-possible-missing-firmware-lib-firmware-i915-kbl-guc-ver9-14-bin-for-mo