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Groups > linux.debian.kernel > #66315

Bug#893912: stretch-backports doesnt help either

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On Sun, 3 Mar 2019 22:46:20 +0000 living proof <livingproof@live.de> wrote:
> for as well stretch-backports does not fix the problem
>

[    2.574742] Bluetooth: hci0: rtl: loading rtl_bt/rtl8821a_config.bin
[    2.575137] bluetooth hci0: firmware: failed to load
rtl_bt/rtl8821a_config.bin (-2)
[    2.575143] bluetooth hci0: Direct firmware load for
rtl_bt/rtl8821a_config.bin failed with error -2
[    2.575145] Bluetooth: hci0: Failed to load rtl_bt/rtl8821a_config.bin

copying rtl8723a_config.bin from
https://github.com/lwfinger/rtl8723au_bt/ to  /lib/firmware/rtl_bt/
does NOT solve the issue. You are actually pointing to a config file
for a completly different device.

We are using the rtl8821a this config file is for the rtl8723au_bt...

Good evening.

I was fighting with this problem (Direct firmware load for
rtl_bt/rtl8821a_config.bin failed with error -2) for some time. In
/lib/firmware/rtl_bt/ directory I found that indeed this file has a
problem to load because this file does not even exist. For some reason
only one file is present, rtl8821a_fw.bin, where another device has
two (rtl8821c_config.bin and rtl8821c_fw.bin):

ls -al /lib/firmware/rtl_bt

...
-rw-r--r--  1 root root 40520 Aug 23 02:04 rtl8812ae_fw.bin
-rw-r--r--  1 root root 37420 Aug 23 02:04 rtl8821a_fw.bin
-rw-r--r--  1 root root    10 Aug 23 02:04 rtl8821c_config.bin
-rw-r--r--  1 root root 37356 Aug 23 02:04 rtl8821c_fw.bin
...

I had package firmware-realtek installed in newest version, so I
downloaded .deb package from Debian webpage
(https://packages.debian.org/buster-backports/firmware-realtek).
Browsing it as
archive I found that file rtl_bt/rtl8821a_config.bin is also absent,
for unknown to me reason.

Then I started looking for this file in other releases (sid and
bullseye), with no positive result. I visited Realtek webpage, only to
find that they have drivers only for Windows for this
device. Digging further, on address
https://patchwork.ozlabs.org/patch/952071/ , I discovered following
note about some Realtek devices:

> The Bluetooth parts of RTL8723D and RTL8723B share the same lmp
> subversion, thus we need to check both lmp subversion and hci revision
> to distinguish the two. The same situation is true for RTL8821A and
> RTL8821C. Accordingly, the selection code is revised.

> To improve maintainability, a new id_table struct is defined, and an
> array of such structs is constructed. Adding a new device can thus be
> as simple as adding another value to the table.

With lack of luck in my quest to find rtl8821a_config.bin file for
Debian Buster I decided to try a crazy idea: duplicate
rtl8821c_config.bin file and rename duplication on
rtl8821a_config.bin.

-rw-r--r--  1 root root 40520 Aug 23 02:04 rtl8812ae_fw.bin
-rw-r--r--  1 root root    10 Feb  5 17:11 rtl8821a_config.bin
-rw-r--r--  1 root root 37420 Aug 23 02:04 rtl8821a_fw.bin
-rw-r--r--  1 root root    10 Aug 23 02:04 rtl8821c_config.bin
-rw-r--r--  1 root root 37356 Aug 23 02:04 rtl8821c_fw.bin


If both devices are so similar, maybe providing fake
rtl8821a_config.bin file will do the trick. After restart I I used
dmesg and checked logs:

[   26.389532] Bluetooth: hci0: RTL: rtl: examining hci_ver=06
hci_rev=000a lmp_ver=06 lmp_subver=8821

[   26.390623] Bluetooth: hci0: RTL: rom_version status=0 version=1

[   26.390624] Bluetooth: hci0: RTL: rtl: loading rtl_bt/rtl8821a_fw.bin

[   26.392597] bluetooth hci0: firmware: direct-loading firmware
rtl_bt/rtl8821a_fw.bin
[   26.392605] Bluetooth: hci0: RTL: rtl: loading rtl_bt/rtl8821a_config.bin

[   26.392748] bluetooth hci0: firmware: direct-loading firmware
rtl_bt/rtl8821a_config.bin
[   26.392757] Bluetooth: hci0: RTL: cfg_sz 10, total sz 17438

Well, it looked promising. I installed some additional
Bluetooth-related packages (blueman, bluewho and entire family of
bluez; bluetooth and bluez were installed earlier) and then I
launched Bluetooth Manager. It turns out that program not only
detected Bluetooth device on my laptop but also I was able to send
files between my laptop and my Nokia mobile on both
directions. I paired successfully both devices, but because lack of
Bluetooth speakers I do not know if it is possible to play music via
Bluetooth. It should be, I hope.

So, my "solution" seems to work, at least for me. But may I ask the
question why file named rtl8821a_config.bin is not present in the
firmware-realtek package? It does not exist at all or was
removed for some reason?

Also my method is nasty, I know about it, but if anyone will solve
his/her problem by it, I will be happy.

With kindest regards,

Oliwia

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Thread

Bug#893912: firmware-realtek: Failed to load rtl_bt/rtl8821a_config.bin "Rathorian" <contact@rathorian.fr> - 2018-03-23 19:20 +0100
  Bug#893912: firmware-realtek: Failed to load rtl_bt/rtl8821a_config.bin Francisco M Neto <fmneto@gmail.com> - 2018-05-09 13:00 +0200
    Re: Bug#893912: firmware-realtek: Failed to load  rtl_bt/rtl8821a_config.bin dugbadman@gmail.com - 2020-01-18 15:40 +0100
    Re: Bug#893912: firmware-realtek: Failed to load  rtl_bt/rtl8821a_config.bin dugbadman@gmail.com - 2020-01-18 16:10 +0100
  Bug#893912: im affected as well on debian stretch 9 living proof <livingproof@live.de> - 2019-03-03 23:40 +0100
  Bug#893912: stretch-backports doesnt help either living proof <livingproof@live.de> - 2019-03-04 00:00 +0100
  Bug#893912: stretch-backports doesnt help either Kate Komi <katahipo@gmail.com> - 2020-02-05 21:10 +0100
  Bug#893912: missing rtl_bt/rtl8821a_config.bin maximilian attems <maks@stro.at> - 2021-02-09 15:30 +0100

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