I installed adv-meme and change the .rc like the wiki said and now my trackball is working :)
I'm pretty happy now

@bogus You can save the relevant part from the configs for the overlay part, they should be easy to re-apply - https://retropie.org.uk/docs/Configuration-Editor/#advanced-configuration

@totallyice Please re-read my previous message. Your system is stuck in a reboot loop so you're not going to be able to access the command line to make any modifications to fix the problem.
In order to fix this error, you'll need to delete/disable the Controlblock service, but you'll either need a Linux computer to read the card's Linux partition (won't work from Windows/macOS) or you can try booting into 'safe mode' on your PI system to have a command line to make modifications. See https://retropie.org.uk/forum/topic/672/a-stop-job-is-running-for-lsb-controlblockservice-init-script/13.

I'm having the same problem where none of my controllers are working in game, however, I know what you're talking about, as I had that same thing (with the having to basically hold all the buttons to get it to open the remap screen) happen to me. Unfortunately, I have no idea what caused it, and I was only able to fix it by doing a clean install. If it's any consolation, since the install I haven't had that problem (just my current one where my controllers aren't working in game)

Did you use the official 4.2 image from the site? Did you read about the info you should post? It's not requested just for the craic. Help us to help you...

@Maynard your question indicates that you didn't map the core specific button configs usinf the core input remapping method.

Reset the changes you made and remap using that method. I think it'll make you happy. ;-)

@obsidianspider the 5 inch hdmi display 800x480 xpt2046 touch controller, latest retropie, and pi3

It could be your joystick is oriented wrong plug the usb in windows and do a joystick test on there to confirm

Thanks guys. I went ahead and ordered the Suzo Happ longstem buttons and the Sanwa joysticks. I am excited for them to come in and I can experiment with getting everything wired up.

Any thoughts or insight as to whether or not I'll be able to utilize USB controllers if desired?

@rbaker I think he's saying the link doesn't provide an answer to his question. Which is true. It provides an answer on how to get help to get an answer to his question.

But again if he'd read the documentation on it I don't believe he would need to ask.

Anyone ?

There was a recent update of the driver. Maybe things are working for you with that then?

@mulder79
Hi did you get this to work in the end I have a similar problem with ipac 2

Did you ever figure out how to do this? I'm interested in the same thing - controlling screen brightness via retropie or some raspian command. Thanks!