How does gnome work without acpid?

Hi,
I have set up gnome3 with laptop-mode-tools, but without acpid on my laptop. The power-management stuff works, but seems incomplete. For example, gnome is able to detect when I remove the AC plug, or close the lid, or press the sleep button. But it does not seem to detect when power is critically low, and does not sleep/hibernate, like it's configured to do. There's also a problem I think to do this when laptop is already sleeping. I left it once over night in sleep mode, with little battery power remaining, to test it. The expectation was to resume from sleep when battery was critically low and go hibernate. Instead it just crashed.
The wiki's suggest that acpid daemon is required to deliver acpi events, but then I wonder: how does gnome (and possibly also laptop-mode-tools) detect these events without acpid?
Razvan

Acpid just listens on acpi events but not creates them.
You can always listen to acpi events using the command 'acpi_listen'
Regards

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How does gnome work without acpid?

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