Recently I've installed Ubuntu 18.04 on my pc alongside Windows 10. I added
nouveau.modeset to grub boot script to be able to log in (there is an issue on Dell XPS 15, which prevents ubuntu from logging in without this option). After that, I wasn't able to change the screen brightness with the usual shortcut
shift+f11/shift+f12. I added
apci_backlight=vendor to the aforementioned grub boot script (
/etc/default/grub). After that, I was able to change the brightness simply by
f11/f12. Also, the sound could be changed with
f3/f4 (I was using
shift+f3/shift+f4 before). The problem is that I can't, for instance, reload the page in the browser with
f5, because the keymap has been changed.
So, the question is: how to change the keymap back again?
Note: The same issue in my Windows installation, so this seems to be a system problem. I already tried to update BIOS firmware to restore the settings, but this didn't work out.