The same problem exists in oneiric with powertop 1.97:
PowerTOP 1.97 Overview Idle stats Frequency stats Device stats
Tunables
Summary: 0.0 wakeups/second, 0.0 GPU ops/second and 0.0 VFS ops/sec
Usage Events/s Category Description
100.0% Device Audio codec hwC0D1: LSI
100.0% Device Audio codec hwC0D0:
Analog Devices
[...]
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https://bugs.launchpad.net/bugs/536631
Title:
an audio device is active 100.0% of the time.
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