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syslog:
2023-09-20T09:32:54.138852+02:00 zaionc kernel: [   13.539860] Bluetooth: hci0: 
Waiting for firmware download to complete
2023-09-20T09:32:54.138857+02:00 zaionc kernel: [   13.540223] Bluetooth: hci0: 
Firmware loaded in 1706498 usecs
2023-09-20T09:32:54.138858+02:00 zaionc kernel: [   13.540278] Bluetooth: hci0: 
Waiting for device to boot
2023-09-20T09:32:54.154894+02:00 zaionc kernel: [   13.555430] Bluetooth: hci0: 
Malformed MSFT vendor event: 0x02
2023-09-20T09:32:54.154908+02:00 zaionc kernel: [   13.555482] Bluetooth: hci0: 
Device booted in 14872 usecs
2023-09-20T09:32:54.154910+02:00 zaionc kernel: [   13.555913] Bluetooth: hci0: 
Found Intel DDC parameters: intel/ibt-19-0-4.ddc
2023-09-20T09:32:54.158856+02:00 zaionc kernel: [   13.558300] Bluetooth: hci0: 
Applying Intel DDC parameters completed
2023-09-20T09:32:54.158859+02:00 zaionc kernel: [   13.559326] Bluetooth: hci0: 
Firmware revision 0.4 build 249 week 27 2023

lshw:
              *-usb:5
                   description: Bluetooth wireless interface
                   product: AX201 Bluetooth
                   vendor: Intel Corp.
                   physical id: a
                   bus info: usb@3:a
                   version: 0.02
                   capabilities: bluetooth usb-2.01
                   configuration: driver=btusb maxpower=100mA speed=12Mbit/s

root@zaionc:~# hcitool lescan
Set scan parameters failed: Input/output error

At first bluetooth stopped working at all due to Ubuntu bug = missing
firmware. It was fixed recently and now the bluetooth module seems fine,
but the whole BTLE part is not available. Particularly I cannot
detect/pair Logitech M720 mouse.

Platform: ThinkPad T14 Gen 2i

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: mantic
-- 
[Intel AX201] Bluetooth LE not working after upgrade from 22.04 to 23.10
https://bugs.launchpad.net/bugs/2037906
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