I used yum --releasever 22 dirstro-sync
upgrade to Fedora 22 alpha.
I removed a lot of system package by mistake.
My touchpad middle button is not working.
I googled a lot of forums and found this configuration, but it still doesn't work.
Section "InputClass"
Identifier "middle button emulation class"
MatchIsPointer "on"
Option "Emulate3Buttons" "on"
EndSection
Need help, thanks.