Bluetooth not working on a combined Wi-Fi and Bluetooth card
A user with a combined PCIe Wi-Fi and Bluetooth module found Bluetooth never worked, on either the distribution kernel or a fresh upstream release.
The advice was to find out which Bluetooth chip is fitted and install its firmware files into the kernel's firmware folder, taking them from the standard firmware repository, then reload the module.
Takeaway. Combination cards can need firmware for each radio. A radio that has never worked may be missing its firmware files.