The following bug has been logged online:

Bug reference:      5397
Logged by:          Steve White
Email address:      stevan_wh...@hotmail.com
PostgreSQL version: 8.4.2
Operating system:   Ubuntu 10.5 beta
Description:        powertop reports excessive wakeups
Details: 

This is a Samsung NC20.  The goal is to use this machine for occasional
testing of a database, but to keep its power consumption minimal.

Intel powertop reports the second biggest cause of wakeups (after the
network device ath) is postgres:

Top causes for wakeups
  23.6% ( 11.7)D  postgres

This is with a cleanly installed database, not being accessed at all.

Cheers!

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