Realtek 8852CE Bluetooth and Wi-Fi not working on Ubuntu 20.04 (Kernel 5.15.0-122)

[Leo5050xvjf]

System Information:

• Operating System: Ubuntu 20.04
• Kernel: 5.15.0-122-generic
• Motherboard: Z790 AORUS ELITE AX-W
• Wireless Network Adapter: Realtek 8852CE
• Driver Version: rtw89 (commit 6dc944)
• Firmware Loaded: rtw8852c_fw.bin

Problem Description:

Both Bluetooth and Wi-Fi are not working properly on the system. Bluetooth cannot detect devices, and dmesg shows the message: Bluetooth: hci0: RTL: unknown IC info, lmp subver 8852, hci rev 000c, hci ver 000c, assuming no firmware upload is required. The Wi-Fi adapter can scan and find available networks, but it cannot connect to any of them. Attempts to connect result in failures, and further investigation may be required.

Steps Taken:

1. Installed and compiled the latest rtw89 driver, and switched to a specific commit (6dc944).
2. Verified that the firmware exists and loaded the correct rtw8852c_fw.bin.
3. Driver modules are loaded correctly (lsmod shows rtw_8852ce and rtw89core modules).

Logs and Related Outputs:

• dmesg | grep -i bluetooth:
  [ 5.873876] usb 1-14: Product: Bluetooth Radio
  [ 6.360216] Bluetooth: Core ver 2.22
  [ 6.360338] NET: Registered PF_BLUETOOTH protocol family
  [ 6.360339] Bluetooth: HCI device and connection manager initialized
  [ 6.360342] Bluetooth: HCI socket layer initialized
  [ 6.360343] Bluetooth: L2CAP socket layer initialized
  [ 6.360345] Bluetooth: SCO socket layer initialized
  [ 6.390009] Bluetooth: hci0: RTL: examining hci_ver=0c hci_rev=000c lmp_ver=0c lmp_subver=8852
  [ 6.601999] Bluetooth: hci0: RTL: examining hci_ver=0c hci_rev=000c lmp_ver=0c lmp_subver=8852
  [ 6.602001] Bluetooth: hci0: RTL: unknown IC info, lmp subver 8852, hci rev 000c, hci ver 000c
  [ 6.602002] Bluetooth: hci0: RTL: assuming no firmware upload needed
  [ 6.897408] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
  [ 6.897409] Bluetooth: BNEP filters: protocol multicast
  [ 6.897411] Bluetooth: BNEP socket layer initialized
  [ 102.806725] Bluetooth: RFCOMM TTY layer initialized
  [ 102.806729] Bluetooth: RFCOMM socket layer initialized
  [ 102.806731] Bluetooth: RFCOMM ver 1.11
  [ 1093.331884] Bluetooth: hci0: urb 00000000ffdf91f6 failed to resubmit (2)
  [ 1093.496013] Bluetooth: hci0: RTL: examining hci_ver=0c hci_rev=000c lmp_ver=0c lmp_subver=8852
  [ 1093.704145] Bluetooth: hci0: RTL: examining hci_ver=0c hci_rev=000c lmp_ver=0c lmp_subver=8852
  [ 1093.704151] Bluetooth: hci0: RTL: unknown IC info, lmp subver 8852, hci rev 000c, hci ver 000c
  [ 1093.704152] Bluetooth: hci0: RTL: assuming no firmware upload needed

• run bluetoothctl
  [bluetooth]# scan on
  Discovery started
  [CHG] Controller 7C:66:EF:F1:06:95 Discovering: yes
  [bluetooth]#

• hciconfig
  hci0: Type: Primary Bus: USB
  BD Address: 7C:66:EF:F1:06:95 ACL MTU: 1021:8 SCO MTU: 255:12
  UP RUNNING PSCAN ISCAN
  RX bytes:4009 acl:0 sco:0 events:390 errors:0
  TX bytes:12910 acl:0 sco:0 commands:370 errors:0

Please help confirm if further driver updates are needed or if there are any other possible solutions.

Thank you!

[tac-dog]

Driver Version: rtw89 (commit 6dc944),when I return to this version，my Wi-Fi can work.

[MiangChen]

Driver Version: rtw89 (commit 6dc944),when I return to this version，my Wi-Fi can work.

git checkout 6dc944 works

[nuricanozturk01]

Driver Version: rtw89 (commit 6dc944),when I return to this version，my Wi-Fi can work.

git checkout 6dc944 works

wifi connection is gone after a while in 6dc944. In my case, ebe87ac is working

[MiangChen]

Driver Version: rtw89 (commit 6dc944),when I return to this version，my Wi-Fi can work.

git checkout 6dc944 works

wifi connection is gone after a while in 6dc944. In my case, ebe87ac is working

I also encountered this problem after I recently updated Ubuntu 20.04. This time I needed to use ebe87ac to successfully install the WIFI driver