I have just upgraded from Maverick to Natty to Oneiric, since Maverick just 
lost security support.  My fan is running at high speed blowing hot air. I have 
now removed my battery from my laptop and I'm strictly running on AC power.  
Powertop shows:
Summary: 355,9 wakeups/second,  0,0 GPU ops/second and 0,0 VFS ops/sec

                Usage       Events/s    Category       Description
            100,0%                      Device         Audio codec hwC0D0: IDT
              3,8 ms/s      86,3        Timer          hrtimer_wakeup
             28,9 ms/s      69,3        Process        
/usr/lib/firefox-11.0/firefox
              2,9 ms/s      46,3        Timer          tick_sched_timer
             22,8 ms/s      33,0        Process        compiz
             10,7 ms/s      31,8        Process        /usr/bin/X :0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp v
              1,5 ms/s      21,2        Interrupt      [44] radeon
             14,3 ms/s       8,2        Process        
/usr/lib/unity/unity-panel-service
             11,1 ms/s       3,0        Process        //bin/dbus-daemon --fork 
--print-pid 5 --print-address 7 --s
            179,1 µs/s       7,2        kWork          ieee80211_iface_work
              0,9 ms/s       6,5        Interrupt      [6] tasklet(softirq)
             33,9 µs/s       4,2        kWork          console_callback
...

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https://bugs.launchpad.net/bugs/877560

Title:
  Audio codec draining power when not in use

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