https://www.digitalocean.com/community/questions/console-stuck-in-caps-lock-mode https://stackoverflow.com/q/27849990 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1532746 https://ubuntuforums.org/showthread.php?t=766619 https://bbs.archlinux.org/viewtopic.php?pid=1692723#p1692723 https://unix.stackexchange.com/q/411655 https://www.linuxquestions.org/questions/bodhi-92/amusing-backlight-gadget-interaction-with-caps-lock-4175646315/#post5949712 https://askubuntu.com/q/742762 googling: GRUB_CMDLINE_LINUX_DEFAULT "i8042" keyboard https://askubuntu.com/q/525629 https://www.kernel.org/doc/Documentation/admin-guide/kernel-parameters.txt https://unix.stackexchange.com/q/28736 googling: debian polkit backlight broken https://askubuntu.com/q/447332 https://unix.stackexchange.com/q/375155 googling: kernel: [ 528.446244] i8042: [131690] 3f <- i8042 (interrupt, 1, 12) https://github.com/torvalds/linux/blob/master/drivers/input/serio/i8042.c https://serverfault.co