Sebastian, thanks for your guidance!

On the laptop, this seems to have improved things a good amount. I will try to 
outline what I observed:
- GUI setting `Performance` correctly yields `performance` from 
`/sys/.../scaling_governor` and seems to allow all cores to peg ~4.4GHz during 
a sysbench run
- GUI setting 'Balanced` yields `powersave` from `/sys/.../scaling_governor` 
but the frequencies and benchmark results are the same as in `performance` mode 
*while plugged in*. On battery, there is a noticeable difference between 
Performance and Balanced
- GUI setting 'Power Save` yields `powersave` from `/sys/.../scaling_governor` 
and shows a noticeable difference from Balanced and Performance, both on 
battery and plugged in
- The GUI setting appears to correctly persist between reboots 

All of that makes me think that the update is working correctly on the
laptop. On the desktop, I observed the same behavior with respect to the
GUI and `/sys/devices/...` output, however, the settings did not seem to
have any notible affect on benchmark performance or core frequencies, or
at least nowhere near as drastic as the laptop. Not sure if this is
because desktops are intended to behave differently or because the
specific CPU in the desktop is still too new to be supported.

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https://bugs.launchpad.net/bugs/2066988

Title:
  Power setting in settings unrelated to actual power settings

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