linux-kernel - Re: 5.16.0-rc7+ Bluetooth error

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Message-ID: <50ea1b0e-28d7-6d04-9c03-4becc4db143b@googlemail.com>
Date:   Fri, 31 Dec 2021 06:21:47 +0000
From:   Chris Clayton <chris2553@...glemail.com>
To:     LKML <linux-kernel@...r.kernel.org>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>
Subject: Re: 5.16.0-rc7+ Bluetooth error

On 30/12/2021 09:21, Chris Clayton wrote:
> Hi,
> 
> I pulled the latest changes into my clone of Linus' tree and built and installed the kernel. (git describe gives
> v5.16-rc7-9-ge7c124bd0463). I'm seeing errors reported by the bluetooth subsystem that i don't see in 5.15.12 or 5.10.89
> 
> The problem seems to occur twice during system startup and on each occasion I see a batch of identical error messages:
> 
> [    3.980822] Bluetooth: hci0: Failed to read codec capabilities (-56)
> [    3.982812] Bluetooth: hci0: Failed to read codec capabilities (-56)
> [    3.984812] Bluetooth: hci0: Failed to read codec capabilities (-56)
> [    3.986608] Bluetooth: hci0: Failed to read codec capabilities (-56)
> [    3.987621] Bluetooth: hci0: Failed to read codec capabilities (-56)
> [    3.988606] Bluetooth: hci0: Failed to read codec capabilities (-56)
> [    3.989650] Bluetooth: hci0: Failed to read codec capabilities (-56)
> 

Sorry, I should have said that despite the above errors, my bluetooth devices still work fine.


> A full dmesg log is attached. I've also attached Two files containing the output from "lsusb -v" run on 5.10.89 and
> 5.16-rc7.
> 
> Please let me know if I can provide any other diagnostic information or test any patches. You'll need to cc me on
> replies because I'm not subscribed to LKML or linux-bluetooth.
> 
> Thanks