Hi I seem to be having the same problem on a hp mini 5101, when i have xfce4-power-manager started I can't get into sleep mode, although it does lock the screen - via xscreensaver
i placed some code in /etc/acpi/sleep.sh and found it was being called but because it xfpm is running it doesn't handle the sleep. I also noticed when i ran xfpm in no deamon mode it couldn't tell what the cpu freq are ! when i kill xfpm sleep button works Alex
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