Originally Posted by rudra-b
yeah...i know the fan is not controllable....what I was thinking of to disable the power of that given usb port
It is possible, but not quite straightforward. The definitive guide on this topic is this one from the kernel documentation:
You need to first identify the usb device number, and locate the corresponding directory under the pseudo-filesystem /sys/bus/usb/devices. There's a "power" subdirectory under the device's directory. By writing to files in this dir, you can control the power usage of the device. If you're using a kernel up to 2.6.32 you can write the word "suspend" in the file power/level to disable the power. I'm running F12 kernel 22.214.171.124-94 and I've tested this with a USB thumb disk ,and it seemed to work. But this feature is removed in more recent kernels.
And this must be done with certain privileges...