BYD TouchPad driver (4.8.1) misdetects a Logitech mouse

BYD TouchPad driver (4.8.1) misdetects a Logitech mouse

[Michael Shell]

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

Re: BYD TouchPad driver (4.8.1) misdetects a Logitech mouse

[Eric Wong]

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
> 

Re: BYD TouchPad driver (4.8.1) misdetects a Logitech mouse

[Ondrej Zary]

On Friday 11 November 2016, Eric Wong wrote:
> 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

The BYD detection is broken. I've seen at least 3 different mice detected as 
BYD touchpad.

-- 
Ondrej Zary