O.K. well I guess I am not alone on this subject. I have not seen any recent posts about this since 2019. It is now 2021 and I just experienced this issue on my 2019 Trail Boss. Not controls, blank screen and the radio could not be turned off or down, or change the channel. I turned the truck off then on again. Nothing... When I arrived at home, I checked fuses all good. I went to back it into the garage and it magically worked. No clue how or why. I did not reset, pull fuses or anything. It just decided to work again, which worries me more as this sounds like such an intermittent problem, like most electrical issues (goblins in the wires). Anyone have a fix or has GM announced a fix yet?