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I was having problems with XFCE power management, suspend options, lid close/open where not working as previously configured. The problem was systemd reacting to theses events, to fix it:
Edit /etc/systemd/logind.conf:
HandlePowerKey=ignore
HandleSuspendKey=ignore
HandleHibernateKey=ignore
HandleLidSwitch=ignore
More info in:
http://www.freedesktop.org/software/sys … .conf.html
http://www.marshut.com/pmnsi/xfce-power … ffect.html
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