Comment 8 for bug 1915117

I installed the following:

linux-headers-5.11.0-051100_5.11.0-051100.202102142330_all.deb
linux-headers-5.11.0-051100-generic_5.11.0-051100.202102142330_amd64.deb
linux-image-unsigned-5.11.0-051100-generic_5.11.0-051100.202102142330_amd64.deb
linux-modules-5.11.0-051100-generic_5.11.0-051100.202102142330_amd64.deb

I was warned for a bunch of "possible missing firmwares" for module i915:

W: Possible missing firmware /lib/firmware/i915/skl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/glk_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/cml_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/icl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/ehl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/ehl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/tgl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/tgl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/dg1_dmc_ver2_02.bin for module i915

(see install.log attached for complete logs)

After disabling Secure Boot and botting in kernel 5.11, I still face the same issue: no input (nor output) sound devices (only "Dummy Output").