In fact I have the same problem with GNOME battery applets. If I add the
battery applet to the panel, I get this error message:
"Can't access ACPI events in /var/run/acpi.socket! Make sure the ACPI
subsystem is working and the acpid daemon is running."
And
$ sudo /etc/init.d/acpid start
* Loading ACPI modules... [ ok ]
* Starting ACPI services...
acpid: can't open /proc/acpi/event: Device or resource busy
$ sudo fuser -v /proc/acpi/event
USER PID ACCESS COMMAND
/proc/acpi/event: haldaemon 4104 f.... hald-addon-acpi
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[Edgy] issues with dbus, powersaved, acpid and kpowersave
https://launchpad.net/bugs/64646
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