Why not implement lulzactive/interactive/zen? without hotplug, or other govs without hotplug.
It seems that hotplug goves are unstable with your kernel, maybe it's better to use the default hotplug logic? or just put an interactive based gov for testing interactive is smarter than ondemand, so in the end u could tune it to be more efficient than hyper maybe?
done already, only nightmare is a hotplug gov, all the rest NOT.