On 15 January 2015 at 22:54, Mason [off-list ref] wrote:

I decided to expose only a small subset of frequencies (namely
{999,500,333,111} MHz) because, in my tests, the ondemand gov
chose mostly min and max, and the intermediate frequencies not
so much; so I figured "2 intermediate freqs" is good enough.
(I'm ready to hear otherwise.)

Following patch solved this issue in 3.17..

6393d6a1027e cpufreq: ondemand: Eliminate the deadband effect