I’ve solved my problem, but posting this because I’m not sure it should have happened, especially in light of the current stage of 15.04 development …
My long-term laptop Dell Vostro 1720 ( because: 1920x1200 
) seemed noisier post Ubuntu-MATE (14.10).
CPU Frequency Scaling Monitor (1.8.0) showed 2.27MHz whenever on AC power, even when idle. Fans blaring. Options were click-able but had no effect, it was stuck on onDemand. But always running at 100%.
cpufreq-info shows:
current policy: frequency range between 2.27MHz and 2.27Mhz!
Some Google’ing found this - see last post. I tried removing cpufreqd and … PEACE 
And options on CPU Frequency Scaling Monitor take effect!
So my questions are:
- Does Ubuntu 14.10 drag in cpufreqd?
- And if it did should it have?
- And should 15.04, etc?
If the answer to that last question is Yes, then I think we’ll need a documented (or GUI) way to make it work at least as well as the default case (no cpufreqd).
If the answers are all No, then I’ll submit a Bug Report.
TIA.