系统更新遇到i915固件缺失的警告：
update-initramfs: Generating /boot/initrd.img-5.5.0-1-amd64
W: Possible missing firmware /lib/firmware/i915/icl_dmc_ver1_09.bin for module i
915
W: Possible missing firmware /lib/firmware/i915/skl_huc_2.0.0.bin for module i91
5
W: Possible missing firmware /lib/firmware/i915/bxt_huc_2.0.0.bin for module i91
5
W: Possible missing firmware /lib/firmware/i915/kbl_huc_4.0.0.bin for module i91
5
W: Possible missing firmware /lib/firmware/i915/glk_huc_4.0.0.bin for module i91
5
W: Possible missing firmware /lib/firmware/i915/kbl_huc_4.0.0.bin for module i91
5
W: Possible missing firmware /lib/firmware/i915/cml_huc_4.0.0.bin for module i91
5
W: Possible missing firmware /lib/firmware/i915/cml_guc_33.0.0.bin for module i9
15
W: Possible missing firmware /lib/firmware/i915/icl_huc_9.0.0.bin for module i91
5
W: Possible missing firmware /lib/firmware/i915/ehl_huc_9.0.0.bin for module i91
5
W: Possible missing firmware /lib/firmware/i915/ehl_guc_33.0.4.bin for module i9
15
W: Possible missing firmware /lib/firmware/i915/tgl_huc_7.0.3.bin for module i91
5
W: Possible missing firmware /lib/firmware/i915/tgl_guc_35.2.0.bin for module i9
15
Processing triggers for libvlc-bin:amd64 (3.0.9.2-1) ..
在这里批量下载：
wget -m -p -E -k -K -np http://anduin.linuxfromscratch.org/sources/linux-firmware/i915/
将所有固件文件拷贝到/usr/lib/firmware/i915/中再次更新即可。