On Jun 06 2017 or thereabouts, Dmitry Torokhov wrote: > The 5th generation Thinkpad X1 Carbons use Synaptics touchpads accessible > over SMBus/RMI, combined with ALPS or Elantech trackpoint devices instead > of classic IBM/Lenovo trackpoints. Unfortunately there is no way for ALPS > driver to detect whether it is dealing with touchpad + trackpoint > combination or just a trackpoint, so we end up with a "phantom" dualpoint > ALPS device in addition to real touchpad and trackpoint. > > Given that we do not have any special advanced handling for ALPS or > Elantech trackpoints (unlike IBM trackpoints that have separate driver and > a host of options) we are better off keeping the trackpoints in PS/2 > emulation mode. We achieve that by setting serio type to SERIO_PS_PSTHRU, > which will limit number of protocols psmouse driver will try. In addition > to getting rid of the "phantom" touchpads, this will also speed up probing > of F03 pass-through port. > > Reported-by: Damjan Georgievski <gdamjan@xxxxxxxxx> > Suggested-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> > --- Thanks for the extensive commit message :) Acked-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx> (tested on a t450s without problems). Cheers, Benjamin > drivers/input/rmi4/rmi_f03.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/input/rmi4/rmi_f03.c b/drivers/input/rmi4/rmi_f03.c > index 77dad045a468..ad71a5e768dc 100644 > --- a/drivers/input/rmi4/rmi_f03.c > +++ b/drivers/input/rmi4/rmi_f03.c > @@ -146,7 +146,7 @@ static int rmi_f03_register_pt(struct f03_data *f03) > if (!serio) > return -ENOMEM; > > - serio->id.type = SERIO_8042; > + serio->id.type = SERIO_PS_PSTHRU; > serio->write = rmi_f03_pt_write; > serio->port_data = f03; > > -- > 2.13.0.506.g27d5fe0cd-goog > > > -- > Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
