The fn + f3 and fn + f4 are not working, the others seem to be working fine. This is what I tried to do to fix it: I opened the grub file using gedit, changed the permission. changed: RUB_CMDLINE_LINUX_DEFAULT=”quiet splash “ into: RUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_backlight=vendor“
But I can't save the file, because it couldn't store a copy. Any advice?
edit: sometimes they seem to work, sometimes notting happens. I can turn on the lights using fn + f4 and by repeadetly clicking fn + f3 and f4, they will eventually turn off. WTF