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    [SOLVED] USB Bluetooth Adapter 5.3 (Realtek 8761) not able to connect

    Using kubuntu 24.04, kernel 6.8.0-47(64 bit)

    Plugging in a new USB bluetooth adapter results in Kubuntu recognizing it and scanning to find devices but it is unable to connect to anything other than my phone. I did some preliminary investigating and it looks like the chipset is realtek 8761:

    https://imgur.com/JLCKYRF

    after some googling found this thread on linux mint forums with guidance on downloading and installing MPOW-supplied firmware files for Realtek RTL8761A and RTL8761B (ID 0bda:8771) Bluetooth chipsets but since it is from 2021 it doesn't seem that the location is still valid and I wasn't sure if it did apply to my case anyhow:

    https://forums.linuxmint.com/viewtopic.php?t=347776

    Code:
    cd ~/Downloads/ && wget https://mpow.s3-us-west-1.amazonaws.com/mpow_BH519A_driver+for+Linux.7z
    sudo apt-get install -y p7zip-full && D=/lib/firmware;N=rtl8761;G=config;E=.bin
    7z x ./mpow_BH519A_driver+for+Linux.7z;cd 202*/rtkbt-firmware/$D/rtlbt;S=sudo;D=$D/rtl_bt/$N
    for C in a_ b_;do for L in fw $G;do F=$D$C$L$E;[ -f $F ]&&$S cp $F{,-`date +%s`};$S cp -f $N$C$L $F;done;done
    cd ~/Downloads/ && rm -r 20201202_LINUX_BT_DRIVER/​
    Would appreciate assistance to fix this issue. Thank you.
    Last edited by Snowhog; Oct 17, 2024, 07:24 PM.
  • Answer selected by Snowhog at Oct 17, 2024, 07:25 PM.

    SOLVED: as I suspected it was not the fault of the OS or the drivers or the hardware, etc. but rather the KDE bluetooth software 'bluedevil' - when I installed blueman, it was able to search, ID, find and connect with the device(s).

    It is unfortunate since the problems with bluedevil have been described quite commonly online by various users over the years, I didn't want to be a negative nancy so I hoped that I was wrong in my hunch that bluedevil was the issue but well, here we are.

    I'll leave this here in case it is useful for others.

    Thank you

    Comment


      #2
      it seems that the firmware is there... so something else is causing the issue:

      Code:
      sudo dmesg | grep -i bluetooth
      
      usb 2-1.1: Product: Bluetooth 5.3 Radio
      Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761
      Bluetooth: hci0: RTL: rom_version status=0 version=1
      Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_fw.bin
      Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_config.bin
      Bluetooth: hci0: RTL: cfg_sz 6, total sz 30210
      Bluetooth: hci0: RTL: fw version 0xdfc6d922
      Bluetooth: MGMT ver 1.22​
      I'm going to try using blueman vs bluedevil to see if that solves the issue of not seeing/connecting to devices

      Comment


        #3
        Originally posted by dect60 View Post
        usb 2-1.1: Product: Bluetooth 5.3 Radio
        Is this in fact, a USB Radio Receiver? (https://www.walmart.com/ip/Bluetooth...erId=101597229)
        Windows no longer obstructs my view.
        Using Kubuntu Linux since March 23, 2007.
        "It is a capital mistake to theorize before one has data." - Sherlock Holmes

        Comment


          #4
          Hi Snowhog, no it is a USB wireless 5.3 adapter from amazon. Sold under a different brand name but from the comments under the product from previous buyers, it is said to work with linux plug and play and to be a realtek 8761B bluetooth 5.3 adapter

          Comment


            #5
            Originally posted by dect60 View Post
            it is said to work with linux plug and play and to be a realtek 8761B bluetooth 5.3 adapter
            I'd leery of that, given the output of sudo dmesg | grep -i bluetooth identifies it as usb 2-1.1: Product: Bluetooth 5.3 Radio <<<

            Where did you purchase it?
            Windows no longer obstructs my view.
            Using Kubuntu Linux since March 23, 2007.
            "It is a capital mistake to theorize before one has data." - Sherlock Holmes

            Comment


              #6
              purchased from amazon marked as USB bluetooth adapter with several previous buyers saying it works well with linux

              Pretty sure that doesn't mean literally a radio, it is a commonly found descriptive, by way of example, here are two others with the same output on stackexchange (askubuntu)

              https://askubuntu.com/questions/1339...es-no-firmware

              https://askubuntu.com/questions/1454...or-it-on-ubunt

              Comment


                #7
                SOLVED: as I suspected it was not the fault of the OS or the drivers or the hardware, etc. but rather the KDE bluetooth software 'bluedevil' - when I installed blueman, it was able to search, ID, find and connect with the device(s).

                It is unfortunate since the problems with bluedevil have been described quite commonly online by various users over the years, I didn't want to be a negative nancy so I hoped that I was wrong in my hunch that bluedevil was the issue but well, here we are.

                I'll leave this here in case it is useful for others.

                Thank you

                Comment

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