I’ve got an LCD deck, is there anyway to force the power on controller feature? The existing Bluetooth card appears to support this functionality.

Based on the commits to the public repo it appears to just be a module loaded into the kernel, and a change to the client to listen to new events. The module in question are hid2hci.

https://gitlab.com/evlaV/jupiter-PKGBUILD/-/blob/master/bluez/0001-valve-bluetooth-config.patch?ref_type=heads

https://gitlab.com/evlaV/linux-integration/-/commit/06bd73d8d986fd7f75310b184fbf09d4977e8eee

https://gitlab.com/evlaV/linux-integration/-/commit/69be18f81e69dfa29b0304c956c27a6ccb510e71