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## GUIDE TO SURVIVE THE ACPID MESS ##
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# Install acpid using apt-get or dnf
sudo dnf install acpid

# Enable acpid at startup
systemctl enable acpid.service

# Check if the use of some keys is inhibited by some program
systemd-inhibit --list


# The following applies if the problem is xfce4-power-manager.

# Tell xfce4 not to handle power key
xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/logind-handle-power-key -n -t bool -s true

# Tell xfce4 not to handle the lid switch
xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/logind-handle-lid-switch -n -t bool -s true

# Tell xfce4 not to handle suspend key
xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/logind-handle-suspend-key -n -t bool -s true

# Tell xfce4 not to handle hibernate key
xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/logind-handle-hibernate-key -n -t bool -s true

# Stop and restart the power manager
xfce4-power-manager -q
xfce4-power-manager

# In /etc/systemd/logind.conf change the following to tell systemd not to handle the some keys
# Power button
HandlePowerKey=ignore

# Suspend key
HandleSuspendKey=ignore

# Hibernate key
HandleHibernateKey=ignore

# The lid switch
HandleLidSwitch=ignore

# Now everything should run smoothly, enjoy your acpid.

# NB: systemd runs acpid as root. I repeat: AS ROOT, not as SUDO. This means that the acpid scripts will often have to use 
# su - user 
# to execute a command from the right username. You will also have to specify stuff like DISPLAY:=0 to instruct X about where to display
# what. Enjoy your acpid experience.