I have been using Xubuntu as single boot on my laptop for about one year and everything worked great, the keys on the keyboard did what they were meant to do.
Then i needed to install Windows 10 for some program in college (Atmel Studio) which wasn't supported on linux.
I did that.
It was kinda hard to install windows after linux without wiping linux out (like creating a partition and installing windows there and make the laptop boot on grub per default so that u can choose the os u want to boot into)
anyways after a while i noticed the brightness keys on my HP Probook which are under f3 and f4 do not change the brightness any more in xubuntu but instead whenever i press them it just mutes/unmutes the microphone. And when i boot in windows the keys do actually change the brightness.
It really bothers to have to go to settings and change brightness each time when the room lighting changes as it used to be so much more convenient just using the keyboard.
I hope some of you guys have an idea of what the problem might be and maybe help me out.
It is Xubuntu actually, because it has an XFCE Desktop.
andi@andilicious:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 19.10 Release: 19.10 Codename: eoan