Hello, I am currently using Nexus 7 2012 Tablet with custom rom [SlimRom]. When connecting a generic game controller via an OTG cable. I am only able to get both the analog stick running, none of the other buttons work. When using gamepad testing app, the app only shows data of the analog sticks only. The game driver detected by the android is DragonRise Inc. Generic USB Joystick. I will greatly appreciate some help regarding the issue.