Powertop doesn't display Power est. column

When I run powertop, it doesn't display the "Power Est." column that shows the estimated power consumption in Watts of each row. It should look like in the screen capture here: https://unix.stackexchange.com/questions/94515/macbook-pro-retina-huge-power-consumption But it actually looks like this: Usage Device name 100.0% USB device: Biometric Coprocessor (STMicroelectronics) 100.0% Display backlight 100.0% Audio codec hwC0D0: Analog Devices 7.2% CPU use 67067 pkts/s Network interface: wlan0 (iwl4965) 0.0 pkts/s Network interface: eth0 (e1000e) The "Power Est." column is missing. The total power discharging from the battery is reported, however. From lore on the net, I can find claims that it just needs more measurements before it will report this data, but no official statement or documentation of this fact. I have run powertop --calibrate several times, and left it running while on battery for hours now. How can I get this column to display, or how many "measurements" does powertop need before it will display this? $ powertop --version PowerTOP versionv2.1, compiled on Aug 23 2012 I'm running Ubuntu 13.04 (raring) on a Lenovo Thinkpad T61p. $ uname -a Linux compy 3.8.0-33-generic #48-Ubuntu SMP Wed Oct 23 09:16:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux I tried installing PowerTop 2.4 from source, but it has the same problem.