[arch-general] Weird problem of ALPS v6 touchpad

[Hexchain Tong]

Hi all,

I'm using Archlinux on a Dell Inspiron 7420 laptop, which has an ALPS
touchpad that doesn't have driver in kernel. Currently
aur/psmouse-alps-driver provides support for it.

But recently some weird problem happened. After I switch off touchpad using
`synclient TouchpadOff=1`, it should be completely turned off. But when I
wipe it with palm, the mouse pointer randomly moves and sometimes even
clicks!

In `xinput list` there is a strange "PS/2 mouse" device:

⎡ Virtual core pointer                     id=2 [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer               id=4 [slave  pointer  (2)]
⎜   ↳ RAPOO RAPOO 5G Wireless Device           id=12 [slave  pointer  (2)]
⎜   ↳ AlpsPS/2 ALPS GlidePoint                 id=17 [slave  pointer  (2)]
⎜   ↳ PS/2 Mouse                               id=15 [slave  pointer  (2)]
[..cut..]

(The RAPOO is my USB mouse and it has nothing to do with the PS/2 device)

I had to use xinput to disable the PS/2 device to stop the problem.

Is there any other input device I don't know inside my laptop? Or, is it a
bug?

More info:

$ dmesg | grep -i "ps/2"
[    2.497642] i8042: PNP: PS/2 Controller [PNP0303:PS2K,PNP0f13:PS2M] at
0x60,0x64 irq 1,12
[    2.502081] mousedev: PS/2 mouse device common for all mice
[   15.025069] input: PS/2 Generic Mouse as
/devices/platform/i8042/serio1/input/input11
[  226.680273] input: PS/2 Mouse as
/devices/platform/i8042/serio1/input/input17
[  226.698384] input: AlpsPS/2 ALPS GlidePoint as
/devices/platform/i8042/serio1/input/input18