Fwd: ALPS v7 TrackStick detected wrongly

["Pali Rohár" <pali.rohar@gmail.com>]

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Hi!

I'm Forwarding to linux-input. Looks like there can be problem with
TPPS2 protocol detection on ThinkPad laptop. Any idea?

-- 
Pali Rohár
pali.rohar@gmail.com

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From: Martin <madstitz@gmail.com>
To: pali.rohar@gmail.com
Subject: ALPS v7 TrackStick detected wrongly
Date: Thu, 14 Jan 2016 13:04:43 +0100
Message-ID: <1452773083.4165.0@smtp.gmail.com>

Hi Mr. Rohar,

I just read about your commit for kernel 4.5 ("Input: ALPS - detect 
trackstick presence for v7 protocol"),
and was wondering if this is addressing a problem I have:

I recently replaced the touchpad of my ThinkPad S440 with the one from 
the T450 (because of the dedicated trackstick buttons).
The touchpad is working fine (including the dedicated buttons), but the 
trackstick doesn't work anymore.

I suspect this is because it is detected incorrectly as an "AlpsPS/2 
ALPS DualPoint Stick" when it should be (and previously was detected 
as) an "TPPS/2 IBM TrackPoint" (checked with other S440 owner).
A friend replaced his T440 touchpad with a T450 touchpad from 
synaptics, and his trackpoint is working fine.

Relevant output of
cat /proc/bus/input/devices

I: Bus=0011 Vendor=0002 Product=0008 Version=0700
N: Name="AlpsPS/2 ALPS DualPoint Stick"
P: Phys=isa0060/serio1/input1
S: Sysfs=/devices/platform/i8042/serio1/input/input8
U: Uniq=
H: Handlers=mouse0 event6
B: PROP=21
B: EV=7
B: KEY=70000 0 0 0 0
B: REL=3

I: Bus=0011 Vendor=0002 Product=0008 Version=0700
N: Name="AlpsPS/2 ALPS DualPoint TouchPad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input5
U: Uniq=
H: Handlers=mouse1 event7
B: PROP=5
B: EV=b
B: KEY=e520 10000 0 0 0 0
B: ABS=260800000000003

I: Bus=0019 Vendor=17aa Product=5054 Version=4101
N: Name="ThinkPad Extra Buttons"
P: Phys=thinkpad_acpi/input0
S: Sysfs=/devices/platform/thinkpad_acpi/input/input9
U: Uniq=
H: Handlers=kbd event8 rfkill
B: PROP=0
B: EV=13
B: KEY=10040 0 18040000 0 10000000000000 0 1501b02102004 
c000280041114000 10e000000000000 0
B: MSC=10


Is your patch intended to solve this or should I open a bug ticket?

Thank you very much for your time!

Greetings
Martin Stitz