[Pkg-xfce-devel] Bug#542238: xfce4-power-manager: ignores suspend and hibernate keys

[Trevor Chart]

I've been having the same issue with xfpm. It's definitely not a 
permanent fix, but commenting out the section of sleep.sh (wherever it 
may be on your system) that checks for a running power manager restores 
the expected functionality. Again, this is just an (_very_) ugly 
hack-around, and YMMV, but it seems to work for me. I'm not precisely 
sure what to expect should xfpm begin handling sleep events, but I'd 
guess that you'd get a "double suspend" where waking the computer up 
from suspend lets the second event put it back to sleep.