Re: [4.12 regression] Thinkpad X250 Touchpad and Trackpoint not recognized anymore; commit e839ffa: "Input: synaptics - add support for Intertouch devices"
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From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: 2017-05-19 19:08:40
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On May 19, 2017 11:46:16 AM PDT, Pascal Wichmann [off-list ref] wrote:
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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