Comment # 18 on bug 1187472 from Peter Aufner

I attempt a more organized summary, maybe someone else can read more into this:

With regards to Bluetooth, I have observed 3 states:
* Bluetooth works fully
* Bluetoothctl list doesn't show the adapter
* Bluetoothctl list shows the adapter but it can't interact with it. (This one,
I have only observed on the 5.12.12 test build)

With regards to hibernation, I have observed the following:
* Hibernation and resume work, along with Wi-Fi but no Bluetooth at all. (This
was only the case for the 5.10 series kernel)
* Hibernation and resume work, Wi-Fi works only before hibernate and Bluetooth
works before hibernate and after resume. (That I have observed on multiple
kernels, after unpacking the Bluetooth firmware. Also unloading of ath11k_pci
before hibernate didn't help. When I tried to load it again, modprobe just got
stuck.)
* Hibernation works but on resume the system freezes. (This I have definitely
observed on the 5.12.12 build, I don't think on the others)

I hope these lists help a bit to shed light on my observations so far.