I have an Optimus chipset:

• Intel HD 4000 (i7-3635QM CPU)
• Geforce 640m

I don't care about the NVIDIA card, so I didn't try to install any proprietary drivers for it.

So:

I was having a choppy+high CPU experience with gnome-shell on Ubuntu 14.04. Only happened when I tried moving a window around quickly.

I used the Intel graphics installer hoping that it will fix the problem.

It did fix the problem, now there is no choppyness or high CPU when I move windows around. However, there is a new problem now:

The fan is rarely quiet, doing barely anything at all will cause the fan to go into loud mode quickly. That happens despite the CPU usage being at just around 4%.

This wasn't the case before installing Intel drivers. It would normally only do that if, for example, I'm installing packages or doing something that puts some stress on the CPU.

I set all CPU cores to "powersave" using cpufreq-set, but nothing changed.

Also on Windows, the fans are really quiet when I'm in powersave mode. I believe they completely shut off for most of the time.

I remember the installer giving me a report at the end as to which packages it installed. Unfortunately, I didn't save the report and I don't know where it would have saved it if it did.

Any ideas or similar experiences?