Today I ran into an odd issue: Since I didn’t have applet installed, I wanted to change my screen’s clarity with the keyboard shortcuts Fn+F4 and Fn+F5. Upon clicking, the system immediately slowed down and finally froze. I had to do a hard reset to have Budgie back.
All other Fn key combinations work normally, apparently. The Clarity-Applet works fine, though.
I am on a Dell Inspriron laptop, with Ubuntu Budgie 19.04 installed.