[Bug 214111] rtl8761b usb bluetooth doesn't work following reboot until unplug/replug

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214111

--- Comment #5 from bryanhoop@gmail.com ---
(In reply to Marco from comment #1)
> Can confirm the same issue personally, but for me it's even worse since this
> firmware doesen't reconnect 9/10 a previously associated device. I've tried
> an updated version for this adapter (2020/12, from the folder name contained
> in it) specific for linux from XMPOW:
> 
> https://mpow.s3-us-west-1.amazonaws.com/mpow_BH519A_driver+for+Linux.7z
> 
> And replaced _fw.bin and _config.bin, but nothing changed.
> 
> Then I've found this post on github:
> 
> https://gist.github.com/peteristhegreat/b48da772167f86f43decbd34edbd0849
> 
> After ordering by date on Microsoft Catalog for "realtek bluetooth", and a
> dozen downloads, I've finally found a package that contained the firmware
> version for this rtl8761b, this specific package:
> https://www.catalog.update.microsoft.com/ScopedViewInline.
> aspx?updateid=b103336e-5da4-4b03-ad04-7224d591aadd, download link:
> http://download.windowsupdate.com/d/msdownload/update/driver/drvs/2021/05/
> ca0e770c-6a5d-4de0-b37a-
> f4b91cccd8c3_7778831d2b9d721cf94d5a8d8c0676ff1b96c874.cab
> 
> This has a date of 26/04/2021, and after extracting
> rtl8761b_mp_chip_bt40_fw_asic_rom_patch_new.dll and renaming the same file
> to rtl8761b_fw.bin and replacing the file contained in /lib/firmware/rtl_bt/
> and deleting the rtl8761b_config.bin file (AFAIK, Windows packages from
> Realtek doesn't come with a config file, but besides an error in kernel the
> _bin is sufficient) my adapter works wonderfully. No issues on reconnecting,
> no issues after reboot, the adapter works correctly.
> 
> Instead of forcing users to randomly download Windows drivers from the web
> in home to find a working and updated version for this device, can Realtek
> add the firmware and kept in sync with the Windows version as it does do
> with the others bluetooth devices supported in kernel? Any way to contact
> them?
> 
> Anyway, for the people who have this issue, try the version linked above.
> 
> Marco.


Thanks for these steps Marco. This gives some hope that a fixed firmware will
eventually be upstreamed on Linux.

I replaced the fw with the MS version in your link and everything is mostly
working now. The major problem I ran into with the updated firmware was audio
dropouts using the A2DP AAC codec, but I switched over to SBC-XQ (even higher
bandwidth, funnily enough) by editing
/usr/share/pipewire/media-session.d/bluez-monitor.conf and it's working
flawlessly now.

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