linux-kernel - Re: 2.6.28 thinks that my PS/2 mouse is a touchpad

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Message-Id: <200901020107.54740.vda.linux@googlemail.com>
Date:	Fri, 2 Jan 2009 01:07:54 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Arjan Opmeer <arjan@...eer.net>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	"Alexander E. Patrakov" <patrakov@...il.com>,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: 2.6.28 thinks that my PS/2 mouse is a touchpad

On Monday 29 December 2008 19:56, Arjan Opmeer wrote:
> On Sat, Dec 27, 2008 at 02:06:29PM +0500, Alexander E. Patrakov wrote:
> > 
> > Linux-2.6.28, as compiled by Arch Linux developers, thinks that my PS/2
> > mouse (a cheap M-BT58 optical wheel mouse by Logitech) is actually a
> > touchpad.  This makes it unusable.  Adding the "proto=imps" parameter to
> > the psmouse module helps.
> 
> > CONFIG_MOUSE_PS2_ELANTECH=y
> 
> Oh dear. The first victim of this driver... :(
> 
> As we can see below the mouse gets detected as an Elantech touchpad. This
> means that it reacts to the Elantech magic knock with the exact same
> response we expect from a real Elantech touchpad.

I am affected too. I am getting:

2009-01-01_23:15:29.11109 kern.info: input: AT Translated Set 2 keyboard as /class/input/input2
2009-01-01_23:15:29.11113 kern.info: elantech.c: Elantech version query result 0x00, 0x01, 0x64.
2009-01-01_23:15:29.11118 kern.info: elantech.c: assuming hardware version 1, firmware version 0.100
2009-01-01_23:15:29.11123 kern.info: elantech.c: Synaptics capabilities query result 0x00, 0x02, 0x64.
2009-01-01_23:15:29.11128 kern.info: input: ETPS/2 Elantech Touchpad as /class/input/input3

and then on attempts to use the mouse:

...
2009-01-01_23:16:08.68831 kern.warn: psmouse.c: Touchpad at isa0060/serio1/input0 lost sync at byte 4
2009-01-01_23:16:08.70630 kern.warn: psmouse.c: Touchpad at isa0060/serio1/input0 lost sync at byte 4
2009-01-01_23:16:08.71730 kern.warn: psmouse.c: Touchpad at isa0060/serio1/input0 lost sync at byte 4
2009-01-01_23:16:08.72918 kern.notice: psmouse.c: Touchpad at isa0060/serio1/input0 - driver resynched.
2009-01-01_23:16:08.74732 kern.warn: psmouse.c: Touchpad at isa0060/serio1/input0 lost sync at byte 4
2009-01-01_23:16:08.75832 kern.warn: psmouse.c: Touchpad at isa0060/serio1/input0 lost sync at byte 4
2009-01-01_23:16:08.76932 kern.warn: psmouse.c: Touchpad at isa0060/serio1/input0 lost sync at byte 4
2009-01-01_23:16:08.78732 kern.warn: psmouse.c: Touchpad at isa0060/serio1/input0 lost sync at byte 4
2009-01-01_23:16:08.79832 kern.warn: psmouse.c: Touchpad at isa0060/serio1/input0 lost sync at byte 4
2009-01-01_23:16:08.79844 kern.notice: psmouse.c: issuing reconnect request
...

On old kernel it was:

2008-10-30_07:37:01.41484 kern.info: input: ImExPS/2 Logitech Wheel Mouse as /class/input/input3

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