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SubjectRe: BYD TouchPad driver (4.8.1) misdetects a Logitech mouse
Sorry for the late response, forwarding to Dmitry and linux-input.
I haven't dealt with input in years...

Michael Shell <list1@michaelshell.org> wrote:
>
> Not a big deal, but something nonetheless ...
>
> I recently upgraded my kernel from 4.3 to 4.8.1 (this is a Linux From
> Scratch build). There was only one obvious hiccup - X would not
> start because it no longer saw the mouse.
>
> I have a Logitech RX250 PS2/USB mouse on the PS/2 port (via a USB->PS2
> adapter):
>
> http://support.logitech.com/en_gb/product/rx250-mouse
>
> The RX250 is a wheel mouse, but with an added left/right scroll wheel
> "tilt" feature to provide for horizontal scrolling.
>
> In my xorg.conf I had:
>
>
> Section "InputDevice"
> Identifier "Mouse0"
> Driver "evdev"
> Option "Name" "ImExPS/2 Logitech Explorer Mouse"
> EndSection
>
>
> However, under the 4.8.1 kernel, cat /proc/bus/input/devices shows:
>
>
> I: Bus=0011 Vendor=0002 Product=0006 Version=0073
> N: Name="ImExPS/2 BYD TouchPad"
> P: Phys=isa0060/serio1/input0
> S: Sysfs=/devices/platform/i8042/serio1/input/input3
> U: Uniq=
> H: Handlers=mouse0 event2
> B: PROP=1
> B: EV=7
> B: KEY=1f0000 0 0 0 0 0 0 0 0
> B: REL=143
>
>
> and dmesg shows the lines:
>
>
> psmouse serio1: logips2pp: Detected unknown Logitech mouse model 115
> input: ImExPS/2 BYD TouchPad as /devices/platform/i8042/serio1/input/input3
>
>
> Changing the mouse name in xorg.conf to "ImExPS/2 BYD TouchPad" did
> allow the mouse to work correctly under X, including the tilt buttons.
> FWIW, in the 4.8.1 kernel config, the byd.c driver does default to
> "Yes", a default which I accepted under make oldconfig.
>
> Apparently, the detection code (byd_detect) in the new byd.c driver,
> which did not even exist in 4.3, (drivers/input/mouse/byd.c) falsely
> sees the Logitech RX250 as being a BYD TouchPad and thus alters the
> vendor and model names.
>
> I do not know if it is also desirable to add an entry for a Logitech
> model 115 in get_model_info in logips2pp.c
> (drivers/input/mouse/logips2pp.c). But if so, I would be willing to
> test any such new code. Even as an unknown Logitech model, it does
> work just fine. I am curious as to how the tilt feature buttons would
> be declared in the model info (would these be PS2PP_EXTRA_BTN,
> or PS2PP_NAV_BTN, etc.?)
>
>
>
> Cheers and thanks in advance,
>
> Mike Shell
>

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