[Bug 209403] c123 Realtek Bluetooth Radio not detected with Kernel 5.9

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https://bugzilla.kernel.org/show_bug.cgi?id=209403

--- Comment #4 from waffen03@xxxxxxxxx ---
(In reply to Dominikus Gierlach from comment #3)
> The issue is still present with 5.9.1.
> 
> Additional information: dmesg output from module loading to `hciconfig hci0
> up':
> 
> [  741.324397] usbcore: registered new interface driver btusb
> [  741.326030] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000c
> lmp_ver=0a lmp_subver=8822
> [  741.327752] Bluetooth: hci0: RTL: rom_version status=0 version=3
> [  741.327757] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cu_fw.bin
> [  741.327889] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cu_config.bin
> [  741.327940] Bluetooth: hci0: RTL: cfg_sz 6, total sz 31422
> [  741.605079] Bluetooth: hci0: RTL: fw version 0x09993aa1
> [  772.977433] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=0999
> lmp_ver=0a lmp_subver=3aa1
> [  772.977446] Bluetooth: hci0: RTL: unknown IC info, lmp subver 3aa1, hci
> rev 0999, hci ver 000a
> [  772.977447] Bluetooth: hci0: RTL: assuming no firmware upload needed
> [  772.994449] debugfs: File 'dut_mode' in directory 'hci0' already present!
> 
> 
> 
> hciconfig hci0 up prints:
> 
> envy# hciconfig hci0 up
> Can't init device hci0: Protocol not supported (93)

Edward's patch https://marc.info/?l=linux-bluetooth&m=160378222632366 
in https://bugzilla.kernel.org/show_bug.cgi?id=208965 worked for me on kernel
version 5.9.1.

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