I am using a raspberry Pi 2 with a Realtek wifi dongle using 8188eufw firmware downloaded from here I have run lsusb and it registered my dongle. The problem is that when I plug the dongle in it disconnects my other usb devices such as my mouse and keyboard. I think this may be a power issue? Is it or do I have some other issue? Also I have an issue connecting to the Internet when it doesn't disconnect my mouse and keyboard. It doesn't connect to the Internet possibly because the normal wpa app that comes with raspian wasn't there. I used the network configuration tool in the toolbar but didn't know whether the 'Ip address' it asked for was external or something else. Pls help I'm desperate. Nothing seems to fix it and I've looked through everything.
This is definitely power related. Have you modified the setting in the boot config that gives the USB ports more power? If not then make sure that that's on. I believe the file is /boot/config. It must be something like that. The setting is something like max_USB_current.