Vielleicht hat es aber auch damit zu tun, dass Tastatur und Touchpad den gleichen Anschluss nutzen (Multiplexing).
Sometimes the keyboard and touchpad work and detected and sometimes they dont get detected but rebooting fixes the problem.
[This is focused towards linux beginners. Plz kindly correct me if I am wrong] This is the most common problem in linux based Operating System...
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For now, Add i8042.reset and i8042.nomux to your kernel boot parameters. If that doesn't fix it, also adding i8042.nopnp and i8042.noloop is worth a try.
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