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Message-ID: <8281ddcc16cc950f9cde4b196cf208adcc798319.camel@hadess.net>
Subject: Re: [Regression] Logitech BT mouse unusable after commit
 532223c8ac57 (still in 6.1-rc8)
From:   Bastien Nocera <hadess@hadess.net>
To:     "Rafael J. Wysocki" <rafael@kernel.org>
Cc:     Jiri Kosina <jikos@kernel.org>,
        Filipe =?ISO-8859-1?Q?La=EDns?= <lains@riseup.net>,
        Benjamin Tissoires <benjamin.tissoires@redhat.com>,
        linux-input@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
        Thorsten Leemhuis <regressions@leemhuis.info>
Date:   Wed, 07 Dec 2022 10:58:53 +0100
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         <2145955.irdbgypaU6@kreacher>
         <CAJZ5v0ic+pm+NWD8g4O2MwQEvi+xuB-W9Wpd6c1RhprhoxuK1g@mail.gmail.com>
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On Wed, 2022-12-07 at 10:36 +0100, Rafael J. Wysocki wrote:
> On Wed, Dec 7, 2022 at 10:16 AM Rafael J. Wysocki <rjw@rjwysocki.net>
> wrote:
> > 
> > On Wednesday, December 7, 2022 10:04:43 AM CET Bastien Nocera
> > wrote:
> > > On Tue, 2022-12-06 at 15:58 +0100, Rafael J. Wysocki wrote:
> > > > Bastien, Jiri,
> > > > 
> > > > Commit 532223c8ac57 ("HID: logitech-hidpp: Enable HID++ for all
> > > > the
> > > > Logitech
> > > > Bluetooth devices") caused my Logitech Bluetooth mouse to
> > > > become
> > > > unusable.
> > > > 
> > > > Appended is the change I need to make it work again (note that
> > > > adding
> > > > the
> > > > device ID to unhandled_hidpp_devices[] doesn't help, so there
> > > > must be
> > > > some
> > > > significant enough difference in how the two cases are handled
> > > > in the
> > > > stack).
> > > > 
> > > > Here's what I get in the log without the patch below:
> > > > 
> > > > [   36.710574] Bluetooth: HIDP (Human Interface Emulation) ver
> > > > 1.2
> > > > [   36.710592] Bluetooth: HIDP socket layer initialized
> > > > [   36.724644] hid-generic 0005:046D:B016.0001: unknown main
> > > > item tag
> > > > 0x0
> > > > [   36.725860] input: Bluetooth Mouse M336/M337/M535 Mouse as
> > > > /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-
> > > > 7:1.0/bluetooth/hci0/hci0:1/0005:046D:B016.0001/input/input14
> > > > [   36.728036] input: Bluetooth Mouse M336/M337/M535 Consumer
> > > > Control
> > > > as /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-
> > > > 7:1.0/bluetooth/hci0/hci0:1/0005:046D:B016.0001/input/input15
> > > > [   36.728823] input: Bluetooth Mouse M336/M337/M535 Keyboard
> > > > as
> > > > /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-
> > > > 7:1.0/bluetooth/hci0/hci0:1/0005:046D:B016.0001/input/input18
> > > > [   36.731550] hid-generic 0005:046D:B016.0001: input,hidraw0:
> > > > BLUETOOTH HID v12.03 Mouse [Bluetooth Mouse M336/M337/M535] on
> > > > 9c:b6:d0:96:8e:c8
> > > > [   36.833039] logitech-hidpp-device 0005:046D:B016.0001:
> > > > unknown
> > > > main item tag 0x0
> > > > [   36.999064] logitech-hidpp-device 0005:046D:B016.0001:
> > > > Device not
> > > > connected
> > > > 
> > > > and here's what I get with it:
> > > > 
> > > > [   43.642546] Bluetooth: HIDP (Human Interface Emulation) ver
> > > > 1.2
> > > > [   43.642559] Bluetooth: HIDP socket layer initialized
> > > > [   43.652898] hid-generic 0005:046D:B016.0001: unknown main
> > > > item tag
> > > > 0x0
> > > > [   43.653833] input: Bluetooth Mouse M336/M337/M535 Mouse as
> > > > /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-
> > > > 7:1.0/bluetooth/hci0/hci0:1/0005:046D:B016.0001/input/input14
> > > > [   43.655025] input: Bluetooth Mouse M336/M337/M535 Consumer
> > > > Control
> > > > as /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-
> > > > 7:1.0/bluetooth/hci0/hci0:1/0005:046D:B016.0001/input/input15
> > > > [   43.655400] input: Bluetooth Mouse M336/M337/M535 Keyboard
> > > > as
> > > > /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-
> > > > 7:1.0/bluetooth/hci0/hci0:1/0005:046D:B016.0001/input/input18
> > > > [   43.657521] hid-generic 0005:046D:B016.0001: input,hidraw0:
> > > > BLUETOOTH HID v12.03 Mouse [Bluetooth Mouse M336/M337/M535] on
> > > > 9c:b6:d0:96:8e:c8
> > > > 
> > > > The only difference seems to be that in the former case the
> > > > logitech-
> > > > hidpp
> > > > driver tries to bind to the device, but I guess that is
> > > > expected.
> > > 
> > > There really shouldn't be that much difference between the 2
> > > paths,
> > > except that hid-logitech-hidpp.c will check that the device
> > > supports
> > > HID++ in its report descriptors, and then start talking to it to
> > > check
> > > whether it's connected.
> > > 
> > > Maybe the device doesn't support HID++?
> > 
> > Quite possibly.
> > 
> > > Can you try running src/tools/hidpp-list-features from
> > > https://github.com/cvuchener/hidpp on the hidraw device for the
> > > mouse?
> > 
> > OK, I'll do that.
> 
> Well, I would if I had a binary.
> 
> Otherwise, I have cmake 3.17 which apparently is too old, sorry.

Revert 308f240585380dd0af4d9f5bbec5eb01e103deca and it will just
require 3.12.

Or use Solaar from your distribution or one of the prebuilt packages
(https://github.com/pwr-Solaar/Solaar/#prebuilt-packages):
solaar -D /dev/hidrawX show