RE: [REGRESSION] rtl8822cu: BLE disconnects with firmware 0x0673_0EDC

[Hilda Wu <hildawu@realtek.com>]

Hi Paul,

Thank you for notifying us and providing the detailed information.
We have already reverted the commit. We will proceed with fixing this issue and provide an updated firmware once the fix is complete.
Thank you again.

Regards,
Hilda

-----Original Message-----
From: Paul Menzel <pmenzel@molgen.mpg.de> 
Sent: Thursday, April 2, 2026 6:22 PM
To: Hilda Wu <hildawu@realtek.com>
Cc: linux-bluetooth@vger.kernel.org; linux-firmware@kernel.org; Josh Boyer <jwboyer@kernel.org>; regressions@lists.linux.dev
Subject: Re: [REGRESSION] rtl8822cu: BLE disconnects with firmware 0x0673_0EDC


External mail : This email originated from outside the organization. Do not reply, click links, or open attachments unless you recognize the sender and know the content is safe.



[To/Cc: +Hilda, linux-firmware@, Josh]

Dear Hilda, dear Josh,


Hilda, unfortunately, you do not have a Linux Kernel Bugzilla account, so I am replying here.

Am 02.04.26 um 01:57 schrieb bugzilla-daemon@kernel.org:
> https://bugzilla.kernel.org/show_bug.cgi?id=221309
>
>              Bug ID: 221309
>             Summary: rtl8822cu: BLE disconnects with firmware 0x0673_0EDC
>                      regression
>             Product: Drivers
>             Version: 2.5
>            Hardware: AMD
>                  OS: Linux
>              Status: NEW
>            Severity: normal
>            Priority: P3
>           Component: Bluetooth
>            Assignee: linux-bluetooth@vger.kernel.org
>            Reporter: i+kernel.org@schimpf.link
>          Regression: No
>
> Created attachment 309794
>    --> 
> https://bugzilla.kernel.org/attachment.cgi?id=309794&action=edit
> stability log after downgrade
>
> Overview
>
> After updating linux-firmware-realtek to 20260221-1 (which includes 
> commit fbf93476, "update rtl8822c bt usb and uart firmware to 
> 0x0673"), the RTL8822CU USB Bluetooth adapter
> (0bda:b00c) begins dropping BLE connections every few minutes. Each 
> disconnect lasts several seconds before the device reconnects. The 
> adapter itself never resets and the USB device remains active throughout. Only the BLE link is lost.

[... Linux 6.19.10-arch1-1 ...]

It looks like, the linux-firmware commit [1][2] caused a regression.
(Also linux-bluetooth@ wasn't in Cc?) Could you please look into it? I recommend to revert it for the time being and cut a new linux-firmware release.


Kind regards,

Paul


PS: Josh, do you have a pointer how to reach the commit from the merge request?

https://gitlab.com/kernel-firmware/linux-firmware/-/merge_requests/900
shows
https://gitlab.com/kernel-firmware/linux-firmware/-/commit/1f806c75e479fea9f222579deb6e69d285b614fc,
but I do not see a way to get to
https://gitlab.com/kernel-firmware/linux-firmware/-/commit/fbf93476.


[1]:
https://lore.kernel.org/all/20260202115751.1056277-1-hildawu@realtek.com/
[2]: https://gitlab.com/kernel-firmware/linux-firmware/-/commit/fbf93476