$ sudo fuser -v /proc/acpi/event
USER PID ACCESS COMMAND /proc/acpi/event: haldaemon 3951 f.... hald-addon-acpi
For dmseg and lsmod outputs, please read bug #64387
$ sudo fuser -v /proc/acpi/event
/proc/acpi/event: haldaemon 3951 f.... hald-addon-acpi
For dmseg and lsmod outputs, please read bug #64387