Re: regression: kernel 6.4.x breaks scanning/pairing (but not use) of LE devices

[Bruno Pitrus <brunopitrus@hotmail.com>]

Dnia piątek, 11 sierpnia 2023 19:11:50 CEST Luiz Augusto von Dentz pisze:
> Hi Bruno,
> 
> On Fri, Aug 11, 2023 at 4:25 AM Bruno Pitrus <brunopitrus@hotmail.com> 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 — using either the
> > > > KDE gui or bluetoothctl — most of the time returns only “classic
> > > > bluetooth” devices like computers and phones, and not the mouse. 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/288c90224eec55d13e786844b7954ef060752089 :
> >
> > > Bluetooth: Enable all supported LE PHY by default
> > > This enables 2M and Coded PHY by default if they are marked as supported
> > > 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.
> 
> 
hciconfig says the below: (I assume “Revision” is the firmware version)

hci0:   Type: Primary  Bus: USB
        BD Address: F0:9E:4A:E6:62:15  ACL MTU: 1021:4  SCO MTU: 96:6
        UP RUNNING 
        RX bytes:150050 acl:8114 sco:0 events:270 errors:0
        TX bytes:5970 acl:69 sco:0 commands:173 errors:0
        Features: 0xbf 0xfe 0x0f 0xfe 0xdb 0xff 0x7b 0x87
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 
        Link policy: RSWITCH SNIFF 
        Link mode: PERIPHERAL ACCEPT 
        Name: '[REDACTED]'
        Class: 0x6c010c
        Service Classes: Rendering, Capturing, Audio, Telephony
        Device Class: Computer, Laptop
        HCI Version: 5.2 (0xb)  Revision: 0x20ce
        LMP Version: 5.2 (0xb)  Subversion: 0x20ce
        Manufacturer: Intel Corp. (2)

I'm unsure how to attach the btmon output as it is a binary file that contains potentially private information (names of nearby devices)