[cups.bugs] Unnecessary resource usage in CUPS
cups-power-bug at hotmail.com
Thu Jun 7 04:06:57 PDT 2007
With no printer attached, cups will poll for a printer every 30 seconds. It will do this even if there are no print jobs in the queue or other requests for the printer. With logging enabled at a high level, this significantly increases system power consumption, since it prevents disks from spinning down. With logging disabled, it still prevents deeper system sleep states, prevents cups from being swapped out to disk, and goes from major problem to minor nuisance. This is a problem with laptops, which are frequently disconnected from power and printers to travel. Cups behavior decreases battery life. Cups should not poll for printers unless there is a specific need to talk to the printer. Furthermore, with USB devices, it should not poll at all, but rather wait for a USB device connect event. This bug report comes from Cups 1.2.7. I do not know
whether it still applies to more recent versions. I furthermore do not
know if it has been reported before.
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