I have Dell Inspiron N5110 laptop which has OPTIMUS technology, so you can switch between NVIDIA GT525 and the Intel Chip. Unfortunately from what i have read, that technology is only supported on Windows and NVIDIA does not have the intention to support it on their Linux drivers (https://github.com/Bumblebee-Project/Bumblebee kind of solved that problem for me when i need something on the NVIDIA chip).
From what i read both VGAs run at the same time because of that problem, causing power consumption is on its max and the machine really gets hot in no time with the fan is running without stop, so i have to stop one of the two manually. Fortunately there is a very simple tool that enables the job.
The tool is called acpi_call, with it you can issue acpi calls manually. I just cloned it locally and built it and then ran the following command to install the module.
sudo insmod acpi_call.ko
sudo depmod -a
They have already made test script called "test_off.sh", once i ran it the fan calmed down after 30 seconds or so. You have to run that tool every time you start your machine.
Note: that test script may not run on your machine so try the following link to get ACPI calls, that might help.