But now did also some testing to make sure and I can confim, both Chocolate Doom and GZDoom just do not detect bluetooth controller in the Linux environment while android apps Delta Touch and Freedoom do detect the controller. So I had very quickly an idea what the problem was. I have a Chromebook and do have alot experience from the limitations of ChromeOS Linux environment and getting things like Doom run on it. I am glad you are taking over the helpdesk staff by cancelling out all variables without testing (A must to do helpdesk in the first place!) so i leave it in your capable hands!