How to find missing firmwares in Zenbook?

This answer motivates me to find missing firmwares in my ultrabook, because I am experiencing difficult typing with many artifacts (here about unable to calibrate typing speed) and CPU up-downs now in one-day old Debian 8.5 with Dvorak. Stephen says that the kernel packages can tell you about missing firmware whenever they are installed or upgraded. However, I would like to get more complete review on it. Characteristics - Graphics lspci -nnk | egrep -iA3 "VGA" 00:02.0 VGA compatible controller : Intel Corporation Device [8086:1916] (rev 07) Subsystem: ASUSTeK Computer Inc. Device [1043:247a] Kernel driver in use: i915 00:04.0 Signal processing controller : Intel Corporation Device [8086:1903] (rev 08) - About failed firmwares where iwlwifi are old messages, I think masi@masi:~$ dmesg | grep firmware [ 1.878929] iwlwifi 0000:01:00.0: firmware: failed to load iwlwifi-7265D-21.ucode (-2) [ 1.878967] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-7265D-21.ucode failed with error -2 [ 1.878985] iwlwifi 0000:01:00.0: firmware: failed to load iwlwifi-7265D-20.ucode (-2) [ 1.879016] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-7265D-20.ucode failed with error -2 [ 1.879027] iwlwifi 0000:01:00.0: firmware: failed to load iwlwifi-7265D-19.ucode (-2) [ 1.879060] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-7265D-19.ucode failed with error -2 [ 1.879070] iwlwifi 0000:01:00.0: firmware: failed to load iwlwifi-7265D-18.ucode (-2) [ 1.879101] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-7265D-18.ucode failed with error -2 [ 1.879111] iwlwifi 0000:01:00.0: firmware: failed to load iwlwifi-7265D-17.ucode (-2) [ 1.879142] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-7265D-17.ucode failed with error -2 [ 1.883577] iwlwifi 0000:01:00.0: firmware: direct-loading firmware iwlwifi-7265D-16.ucode [ 1.883896] iwlwifi 0000:01:00.0: loaded firmware version 16.242414.0 op_mode iwlmvm [ 1.916244] i915 0000:00:02.0: firmware: failed to load i915/skl_dmc_ver1.bin (-2) [ 1.916249] i915 0000:00:02.0: Direct firmware load for i915/skl_dmc_ver1.bin failed with error -2 [ 1.916251] i915 0000:00:02.0: Failed to load DMC firmware [https://01.org/linuxgraphics/intel-linux-graphics-firmwares] , disabling runtime power management. [ 2.292574] bluetooth hci0: firmware: direct-loading firmware intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq [ 2.292579] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq [ 2.544000] Bluetooth: hci0: Intel Bluetooth firmware patch completed and activated Installed firmwares and removed packages in debian - apt-get -t jessie-backports install linux-image-amd64 - apt-get -t jessie-backports install firmware-iwlwifi - apt-get remove xserver-xorg-video-intel 2nd iteration after Stephen's answer --- The non-free package solves the graphical artifact in Matlab 2016a described here . My dmesg now where everything is ok [Stephen] because 17-21 of wifi firmware fail, but 16 iteration succeeds eventually; no other firmware failures visible masi@masi:~$ dmesg | grep firmware [ 1.897923] iwlwifi 0000:01:00.0: firmware: failed to load iwlwifi-7265D-21.ucode (-2) [ 1.897961] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-7265D-21.ucode failed with error -2 [ 1.897973] iwlwifi 0000:01:00.0: firmware: failed to load iwlwifi-7265D-20.ucode (-2) [ 1.898009] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-7265D-20.ucode failed with error -2 [ 1.898017] iwlwifi 0000:01:00.0: firmware: failed to load iwlwifi-7265D-19.ucode (-2) [ 1.898121] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-7265D-19.ucode failed with error -2 [ 1.898129] iwlwifi 0000:01:00.0: firmware: failed to load iwlwifi-7265D-18.ucode (-2) [ 1.898165] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-7265D-18.ucode failed with error -2 [ 1.898173] iwlwifi 0000:01:00.0: firmware: failed to load iwlwifi-7265D-17.ucode (-2) [ 1.898209] iwlwifi 0000:01:00.0: Direct firmware load for iwlwifi-7265D-17.ucode failed with error -2 [ 1.904430] iwlwifi 0000:01:00.0: firmware: direct-loading firmware iwlwifi-7265D-16.ucode [ 1.904726] iwlwifi 0000:01:00.0: loaded firmware version 16.242414.0 op_mode iwlmvm [ 1.917970] i915 0000:00:02.0: firmware: direct-loading firmware i915/skl_dmc_ver1.bin Hardware: Asus Zenbook UX303UA OS: Debian 8.5 64 bit Linux kernel: 4.6