Messages in this thread |  | | Date | Sat, 15 Oct 2016 23:24:44 -0400 | From | Michael Shell <> | Subject | BYD TouchPad driver (4.8.1) misdetects a Logitech mouse |
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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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