Bluetooth 5.0 Realtek RTL8761B Support

TasTraceur · December 8, 2020 at 12:44 PM

I have a Raspberry Pi 2 and the lastest version of LibreElec. Everything works great (thanks).

I had an old Bluetooth 2.0 (15 years old) that worked fine, but sometimes there was some interference in the audio.

Now I have bought a bluetooth 5.0 (Realtek RTL8761B) that does not detect, I think is a problem with the drivers, according to what I have searched on the internet.

The bluetooth works fine, I tested it in mi Windows and checked also that it is Bluetooth 5.0 (HCI 9.55449 / LMP 9.25805).

Is there a provision to soon include the necessary drivers? Are they already included and do I have to activate something?

Thanks

**mglae** · December 8, 2020 at 4:07 PM

Realtek RTL8761B - LinuxReviews

Should work with nightlies.

**chewitt** · December 8, 2020 at 4:19 PM Official Post

It might be missing the firmware, in which case you'll need to share "dmesg | paste" output so we can see the error message that tells us which file can't be found (so we can pick/add it).

TasTraceur · December 8, 2020 at 7:56 PM

Wow, so easy

http://ix.io/2HbW

Code

...
[    2.013181] usb 1-1.3: new full-speed USB device number 4 using dwc_otg
[    2.106187] usb 1-1.3: New USB device found, idVendor=0bda, idProduct=8771, bcdDevice= 2.00
[    2.106207] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    2.106218] usb 1-1.3: Product: Bluetooth Radio
[    2.106229] usb 1-1.3: Manufacturer: Realtek
[    2.106239] usb 1-1.3: SerialNumber: 00E04C239987
[    2.111598] fsck: CP437: Invalid argument
[    2.111972] fsck: Storage: clean, 7076/673296 files, 136438/2693120 blocks
[    2.112200] fsck: fsck.fat 4.1 (2017-01-24)
[    2.112507] fsck: /dev/mmcblk0p8: 248 files, 18047/65501 clusters

...

[    8.641445] 
[    8.641489] Bluetooth: hci0: RTL: rtl: loading rtl_bt/rtl8761a_fw.bin
[    8.641489] 
[    9.240828] Bluetooth: hci0: RTL: rtl: loading rtl_bt/rtl8761a_config.bin
[    9.240828] 
[    9.241371] bluetooth hci0: Direct firmware load for rtl_bt/rtl8761a_config.bin failed with error -2
[    9.241464] Bluetooth: hci0: RTL: cfg_sz -2, total sz 20204
[    9.241464] 
[    9.420038] snd_bcm2835: module is from the staging directory, the quality is unknown, you have been warned.
[    9.450731] bcm2835_audio soc:audio: card created with 8 channels
[   10.073712] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup
[   10.187548] 8021q: 802.1Q VLAN Support v1.8
[   11.511263] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xC5E1
[   11.576568] Bluetooth: hci0: command 0xfc20 tx timeout
[   12.358734] EXT4-fs (mmcblk0p7): mounted filesystem with ordered data mode. Opts: (null)
[   13.121713] FAT-fs (sda2): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[   13.347306] fuse init (API version 7.27)
[   19.469908] Bluetooth: hci0: RTL: download fw command failed (-110)

Display More

**mglae** · December 8, 2020 at 10:53 PM

Code

mkdir -p /storage/.config/firmware/rtl_bt
wget -P /storage/.config/firmware/rtl_bt https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_bt/rtl8761a_fw.bin

The config file is optional.

TasTraceur · December 9, 2020 at 4:52 PM

I executed both commands and nothing, the result is the same:

http://ix.io/2HjU

I tried also with 777 permission in the new file with the same output.

Maybe I have to do something more, I dont know

**smp** · December 9, 2020 at 5:24 PM

Quote from TasTraceur

Maybe I have to do something more

You should use a nightly build, not a stable 9.2.6.

Or self-compile from a libreelec-9.2 branch and add a patch for RTL8761B support.

TasTraceur · December 10, 2020 at 4:04 PM

Oh

How I to install a nightly build? I search in the options and the option to update non release version not appear (or I dont know how).

The second option sound more complex I can wait for the fix to be included in the next release (assuming it isn't in 1 year ).

Thanks for your responses.

**CvH** · December 13, 2020 at 7:42 PM Official Post

current master

Code

[24120.584775] usb 3-4: new full-speed USB device number 3 using xhci_hcd
[24120.760564] Bluetooth: Core ver 2.22
[24120.760576] NET: Registered protocol family 31
[24120.760577] Bluetooth: HCI device and connection manager initialized
[24120.760580] Bluetooth: HCI socket layer initialized
[24120.760581] Bluetooth: L2CAP socket layer initialized
[24120.760584] Bluetooth: SCO socket layer initialized
[24120.765121] usbcore: registered new interface driver btusb
[24120.777431] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761
[24120.778267] Bluetooth: hci0: RTL: rom_version status=0 version=1
[24120.778268] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761b_fw.bin
[24120.778427] bluetooth hci0: Direct firmware load for rtl_bt/rtl8761b_fw.bin failed with error -2
[24120.778429] Bluetooth: hci0: RTL: firmware file rtl_bt/rtl8761b_fw.bin not found
[24120.792471] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[24120.792472] Bluetooth: BNEP filters: protocol multicast
[24120.792475] Bluetooth: BNEP socket layer initialized

Display More

I pr changes as soon I fixed it.

**CvH** · December 16, 2020 at 3:00 PM Official Post

Quote from TasTraceur

How I to install a nightly build?

Just download the generic build from test.libreelec.tv and drop the image (LE-Generic...img.gz) to the update folder at you box.

Got the FW working rtl_bt.zip

extract firmware folder

TasTraceur · December 18, 2020 at 5:54 PM

Oh, perfect. Many thanks. I download LibreELEC-Generic.x86_64-9.80-nightly-20201217-76a852d.img.gz and the firmware.

Does the update go inside /storage/.update?

Does the firmware go inside /storage/.config/firmware/rtl_bt?

And the last question (I hope). When updating this version, will the system continue to update automatically? And, with the next update will the change be lost?

Thanks.

**mglae** · December 18, 2020 at 9:32 PM

If you are still using a RPI2 you do need LibreELEC-RPi2.arm-9.80-nightly-20201218-76a852d.img.gz

> Does the update go inside /storage/.update?

Yes

> Does the firmware go inside /storage/.config/firmware/rtl_bt?

Yes

> When updating this version, will the system continue to update automatically?

No.

> with the next update will the change be lost?

No

TasTraceur · December 19, 2020 at 7:02 PM

Thanks for the advise about the version.

And, when the new version will was release, will I have to update it manually?

I saw that file: LibreELEC-RPi2.arm-9.80-nightly-20201218-76a852d-noobs.tar.

I have Noobs in my Raspberry (Libreelec and Raspbian). It is not a problem for install LibreELEC-RPi2.arm-9.80-nightly-20201218-76a852d.img.gz file?

Tomorrow I will try it.

Many thanks.

**CvH** · December 20, 2020 at 9:47 AM Official Post

Oh didn't saw that you use a RPi2, I advise against using the current LE10 nightly images, there is too much broken and not working for RPi0-3 !

TasTraceur · December 20, 2020 at 4:58 PM

Oh

LibreELEC-RPi2.arm-9.80-nightly-20201218-76a852d.img.gz didn't work for me

With the config file of the firmware:

http://ix.io/2IT6

Without the config file of the firmware:

http://ix.io/2IT8

And all addons are now uncompatible

Oh sh..t I think that it works with the last nightly build, but the problem is I not read correctly your message... Ouch

Luckily I had the backup of LibreELEC (Leia) 9.2.6

I will keep this version until you confirm that it is already supported.

Thanks.

sk8erboy · January 27, 2021 at 1:11 AM

I have a bluetooth adapter that uses this chip

I install LibreELEC-Generic.x86_64-9.80-nightly-20210125-b8007d5.img.gz

Code

[ 9.957581] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 9.957585] Bluetooth: BNEP filters: protocol multicast
[ 9.957591] Bluetooth: BNEP socket layer initialized
[ 11.686198] Bluetooth: hci0: command 0x1001 tx timeout
[ 13.203735] e1000e 0000:00:19.0 eth0: NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
[ 13.203887] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 13.218570] 8021q: 802.1Q VLAN Support v1.8
[ 19.792863] Bluetooth: hci0: RTL: HCI_OP_READ_LOCAL_VERSION failed (-110)

http://ix.io/2Nrb

TasTraceur · January 30, 2021 at 12:36 PM

I've thought better of it and I'm going to try this option:

Quote from smp

Or self-compile from a libreelec-9.2 branch and add a patch for RTL8761B support.

Because now everything works perfectly, so I prefer to modify the version I have to include only bluetooth.

Now I have Librelec 9.2.6 (kernel: Linux 4.19.127) with Kodi 18.9.0 Git:newclock5_18.9-Leia from 2020-10-25.

Can someone help me with an explanation of how I should compile for the Raspberry Pi 2 the same versión with only the modification of the bluetooth?

A lot of thanks.

(I put the firmware in the firmware folder of Raspbian in the same Raspberry and works without any other change)

**chewitt** · January 31, 2021 at 2:18 AM Official Post

Quote from TasTraceur

Because now everything works perfectly and in the new release I will lose at least the ShitCrapStream

^ ...stream is piracy and forum rules state that support stops pending proof of a system free of piracy add-ons/services etc.