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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date:   Fri, 11 Aug 2023 10:11:50 -0700
Message-ID: <CABBYNZ+Nt3Rho2=VtVrspRLond2agnKhT1LmeLCGdY4fdxmusg@mail.gmail.com>
Subject: Re: regression: kernel 6.4.x breaks scanning/pairing (but not use) of
 LE devices
To:     Bruno Pitrus <brunopitrus@hotmail.com>
Cc:     Paul Menzel <pmenzel@molgen.mpg.de>,
        "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>,
        "regressions@lists.linux.dev" <regressions@lists.linux.dev>,
        Takashi Iwai <tiwai@suse.de>,
        Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
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Hi Bruno,

On Fri, Aug 11, 2023 at 4:25=E2=80=AFAM Bruno Pitrus <brunopitrus@hotmail.c=
om> wrote:
>
> Dnia sobota, 5 sierpnia 2023 09:31:08 CEST Paul Menzel pisze:
> > [Cc: +regressions@]
> >
> > #regzbot introduced v6.3.9..v6.4.2
> >
> > Dear Bruno,
> >
> >
> > Thank you for your report.
> >
> > Am 04.08.23 um 20:55 schrieb Bruno Pitrus:
> > > I am using openSUSE Tumbleweed on a Dell Precision 3551 which has a
> > > bluetooth adapter of ID 8087:0026 (Intel AX201). I am using a
> > > Logitech M575 trackball mouse which only supports Bluetooth LE.
> > >
> > > With kernel 6.4.2 or newer, scanning for devices =E2=80=94 using eith=
er the
> > > KDE gui or bluetoothctl =E2=80=94 most of the time returns only =E2=
=80=9Cclassic
> > > bluetooth=E2=80=9D devices like computers and phones, and not the mou=
se. If
> > > the mouse was paired before, it works correctly however.
> > >
> > > With previous kernel versions (6.3.9 and before), pairing the mouse
> > > worked correctly.
> >
> > Are you able to bisect the regression? Please also attach the Linux
> > messages. (You can also create a ticket in the Linux kernel Bugzilla [1=
]
> > and attach everything there.)
> >
> >
> > Kind regards,
> >
> > Paul
> >
> >
> > [1]: https://bugzilla.kernel.org/
> >
>
> The offending commit is https://github.com/SUSE/kernel/commit/288c90224ee=
c55d13e786844b7954ef060752089 :
>
> > Bluetooth: Enable all supported LE PHY by default
> > This enables 2M and Coded PHY by default if they are marked as supporte=
d
> > in the LE features bits.
> >
> > Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Do you have the btmon/HCI traces showing this, we also need the
firmware version as well since I suspect this is due to the controller
setting the PHYs as supported but being unable to to use them
properly.

--=20
Luiz Augusto von Dentz