linux-kernel - Re: [4.12 regression] Thinkpad X250 Touchpad and Trackpoint not recognized anymore; commit e839ffa: "Input: synaptics

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Date:   Fri, 19 May 2017 12:08:34 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Pascal Wichmann <pascal.wichmann@...w.de>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
CC:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [4.12 regression] Thinkpad X250 Touchpad and Trackpoint not recognized anymore; commit e839ffa: "Input: synaptics - add support for Intertouch devices"

On May 19, 2017 11:46:16 AM PDT, Pascal Wichmann <pascal.wichmann@...w.de> wrote:
>Hello,
>
>using the latest 4.12-rc1 kernel, the trackpoint and touchpad of my
>Thinkpad X250 are not recognized.
>
>This is caused by commit
>e839ffa  Input: synaptics - add support for Intertouch devices
>
>
>The specific problem seems to be the detection of whether to use
>synaptics_intertouch for the psmouse module or not. That parameter
>is set to -1 by default, in which case synaptics_intertouch is
>enabled on my device.
>
>When I explicitly set that parameter to 0, the trackpoint and touchpad
>are recognized and work as expected.
>
>Removing my device from smbus_pnp_ids in 4.12 rc1 fixes the issue
>without need to manually disable synaptics_intertouch in the psmouse
>module:
>
>diff -ruN a/drivers/input/mouse/synaptics.c
>b/drivers/input/mouse/synaptics.c
>--- a/drivers/input/mouse/synaptics.c	2017-05-19 19:31:48.930734395
>+0200
>+++ b/drivers/input/mouse/synaptics.c	2017-05-19 19:32:00.490782484
>+0200
>@@ -170,7 +170,6 @@
> static const char * const smbus_pnp_ids[] = {
>	/* all of the topbuttonpad_pnp_ids are valid, we just add some extras
>*/
> 	"LEN0048", /* X1 Carbon 3 */
>-	"LEN0046", /* X250 */
> 	"LEN004a", /* W541 */
> 	"LEN200f", /* T450s */
> 	NULL
>
>
>Is the ThinkPad X250 not supporting intertouch or is there another
>problem causing the input devices not to work with it enabled?
>

Do you have i801_smbus driver enabled and loaded?


Thanks.

-- 
Dmitry