Ok so, after a discussion in irc, CPU_FREQ_DEFAULT_GOV_POWERSAVE=y was a leftover from the original rpi2 defconfig, while in the 4.2 kernel we changed it to CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y and it seems the situation there has improved: if you can confirm this, i'll push a config changes to the 3.19 tree (just in case someone want to use it) and close this bug.
Ok so, after a discussion in irc, CPU_FREQ_ DEFAULT_ GOV_POWERSAVE= y was a leftover from the original rpi2 defconfig, while in the 4.2 kernel we changed it to CPU_FREQ_ DEFAULT_ GOV_PERFORMANCE =y and it seems the situation there has improved: if you can confirm this, i'll push a config changes to the 3.19 tree (just in case someone want to use it) and close this bug.