Bluetooth rtl8761bu problem.

[ffafoz]

Good afternoon,
USB bluetooth adapter is available.
It is defined like this.

[227331.427866] usb 1-6: new full-speed USB device number 6 using xhci_hcd
[227331.555046] usb 1-6: New USB device found, idVendor=0bda, idProduct=a729, bcdDevice= 2.00
[227331.555049] usb 1-6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[227331.555050] usb 1-6: Product: Bluetooth 5.3 Radio
[227331.555052] usb 1-6: Manufacturer: Realtek
[227331.555053] usb 1-6: SerialNumber: 00E04C239987
[227331.558751] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761
[227331.559702] Bluetooth: hci0: RTL: rom_version status=0 version=1
[227331.559705] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_fw.bin
[227331.566735] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_config.bin
[227331.566919] Bluetooth: hci0: RTL: cfg_sz 6, total sz 30210
[227331.715847] Bluetooth: hci0: RTL: fw version 0xdfc6d922
[227331.783957] Bluetooth: MGMT ver 1.22

From the looks of it seems to be all good, but occasionally there are problems with connecting to various devices. not immediately after booting, but after a while.
In the logs I see these errors

[227486.545107] Bluetooth: hci0: command tx timeout

or

[216024.831536] Bluetooth: Unexpected start frame (len 17)
[216098.518685] Bluetooth: Unexpected start frame (len 17)
[216522.377837] Bluetooth: Unexpected start frame (len 17)
[218276.309116] Bluetooth: Unexpected start frame (len 17)
[218600.421766] Bluetooth: Unexpected start frame (len 16)
[218697.648804] Bluetooth: Unexpected start frame (len 17)
[219297.910319] Bluetooth: Unexpected start frame (len 4)
[220067.541670] Bluetooth: Unexpected start frame (len 13)
[220339.003401] Bluetooth: Unexpected start frame (len 17)
[220903.352551] Bluetooth: Unexpected start frame (len 13)
[221088.352450] Bluetooth: Unexpected start frame (len 16)
[221689.783685] Bluetooth: Unexpected start frame (len 17)
[222477.045898] Bluetooth: Unexpected start frame (len 1)
[222961.361939] Bluetooth: Unexpected start frame (len 9)
[223447.919058] Bluetooth: Unexpected start frame (len 17)
[223750.389957] Bluetooth: Unexpected start frame (len 17)
[223842.867789] Bluetooth: Unexpected start frame (len 3)
[224247.829183] Bluetooth: Unexpected start frame (len 12)
[224654.432997] Bluetooth: Unexpected start frame (len 9)

How fix this ?
OS

DISTRIB_RELEASE=24.04
Kernel : 6.8.0-39-generic

[currentshaft]

Are you using wireless (wifi)? If so, which channel are you on?

[ffafoz]

I'm sorry, but what does this have to do with Wi-Fi?
I'm using a USB bluetooth adapter.
I don't use Wifi on this pc, everything is connected by cable.

[#&thj^%]

Please see if this has any promise: https://fosspost.org/fix-bluetooth-r...x-ubuntu-22-04

[ffafoz]

Please see if this has any promise: https://fosspost.org/fix-bluetooth-r...x-ubuntu-22-04

nope, sorry.
this is diferent problem.
This person has a problem with drivers, I do not have such a problem, I have for some reason it falls out intermittently here in timeout.

[#&thj^%]

So you feel your driver is ok?
Anywho will you show this:

journalctl -b | grep -i bluetooth