[Bug 219854] New: Bluetooth devices can't connect after toggling Bluetooth unless they are re-paired

[Bug 219854] New: Bluetooth devices can't connect after toggling Bluetooth unless they are re-paired

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219854

            Bug ID: 219854
           Summary: Bluetooth devices can't connect after toggling
                    Bluetooth unless they are re-paired
           Product: Drivers
           Version: 2.5
          Hardware: Intel
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: linux-bugzilla@ericswpark.com
        Regression: No

Created attachment 307785
  --> https://bugzilla.kernel.org/attachment.cgi?id=307785&action=edit
dmesg output on Linux Mint during reproduction of bug

I noticed that my Bluetooth headsets would fail to reconnect to my NixOS laptop
running `6.13.5` if I toggled (disable -> enable) the BT module. When this
occurs, attempting to connect again via KDE's Bluetooth panel (or the Cinnamon
BT applet in case of Linux Mint) would fail with a "Connection Failed" error.
The only way to fix this is to unpair the devices, then re-pair them and
connect to them again. Then BT will continue to work until the module is
toggled and/or the laptop enters sleep (I guess the module gets power-cycled
during sleep).

Under Windows this does not occur. On a live Linux Mint boot running kernel
`6.8.0-51-generic` the same issue occurs. I am not sure if this is a regression
or not as I have not tested earlier versions of the kernel.

Attached `dmesg` output from the Linux Mint reproduction, after toggling the
module on and attempting to connect to the previously paired device.

I also posted about this on the NixOS forums here
(https://discourse.nixos.org/t/cant-reconnect-to-paired-bluetooth-devices-after-toggling-bt-unless-i-re-pair/61366)
and that post contains some screenshots of the issue occurring on KDE, as well
as `dmesg` output from the NixOS system (which seems to be more sparse compared
to the Linux Mint output).

This was tested on a ThinkPad T480 running the Intel Corporation Wireless 8265
/ 8275 (rev 78) card, on NixOS-unstable `6.13.5`. I tested two headsets (Buds2
Pro / Sony WH-1000XM5) and they both "fail" in the same way.

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[Bug 219854] Bluetooth devices can't connect after toggling Bluetooth unless they are re-paired

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219854

--- Comment #1 from Eric Park (linux-bugzilla@ericswpark.com) ---
Problem persists on 6.14.0.

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[Bug 219854] Bluetooth devices can't connect after toggling Bluetooth unless they are re-paired

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219854

Eric Park (linux-bugzilla@ericswpark.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|                            |6.14.0

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[Bug 219854] Bluetooth devices can't connect after toggling Bluetooth unless they are re-paired

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219854

Eric Park (linux-bugzilla@ericswpark.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |UNREPRODUCIBLE

--- Comment #2 from Eric Park (linux-bugzilla@ericswpark.com) ---
I tried different kernel versions today to see if this was a regression, but
after changing through kernels 5.15.x, 6.1.x, 6.12.21, and 6.13.9, I was unable
to reproduce the issue. In fact, after switching back to the latest kernel
version available on NixOS (6.14.0) the same two headsets that I used continue
to connect properly, even when toggling Bluetooth power and suspending the
entire laptop. Closing as the bug cannot be reproduced anymore.

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[Bug 219854] Bluetooth devices can't connect after toggling Bluetooth unless they are re-paired

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219854

Paul Menzel (pmenzel+bugzilla.kernel.org@molgen.mpg.de) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pmenzel+bugzilla.kernel.org
                   |                            |@molgen.mpg.de

--- Comment #3 from Paul Menzel (pmenzel+bugzilla.kernel.org@molgen.mpg.de) ---
Should it happen again, I think, the output of `sudo btmon` could be helpful.

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