linux-kernel - Re: [PATCH] Input: synaptics - switch t460s 20FN to use RMI4 over SMBus

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Date:   Mon, 26 Jun 2017 17:38:56 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Christopher Bachner <b.christopher.92@...il.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: synaptics - switch t460s 20FN to use RMI4 over
 SMBus

On Jun 26 2017 or thereabouts, Christopher Bachner wrote:
> Hello,
> 
> I am assuming that if the inertouch message is not showing up in dmesg,
> then it is working. Is that a correct assumption?
> 
> Either way I also attached my dmesg.
> 
> I am not sure, though, why the scroll mode still freezes if I move the my
> fingers quickly on the touchpad while also using the trackpoint. Is that
> maybe a future fix and this change is just the foundation for it? Overall
> the usage of the trackpoint is better now for sure.

Sadly, you are also hit by:
[    6.355378] i801_smbus 0000:00:1f.4: BIOS is accessing SMBus registers
[    6.355380] i801_smbus 0000:00:1f.4: Driver SMBus register access inhibited

Which disables entirely the RMI4 over SMBus module. And then we can not
probe for it, meaning you are stuck with the PS/2 crappy mode.

We are aware of this bug and we'll try to fix that. I think the test you
provides are valid (the patch works as expected), but a different bug
prevents rmi-smbus to fully initialize the touchpad :(

Cheers,
Benjamin

> 
> 
> (Resending again without attachment since the linux-kernel@...r.kernel.org
> and linux-input@...r.kernel.org don't accept attachments)
> 
> 
> ---
> Thanks,
> 
> Christopher Bachner
> 
> ---
> Thanks,
> 
> Christopher Bachner
> 
> On Mon, Jun 26, 2017 at 8:12 AM, Christopher Bachner <
> b.christopher.92@...il.com> wrote:
> 
> > Hello,
> >
> > I am assuming that if the inertouch message is not showing up in dmesg,
> > then it is working. Is that a correct assumption?
> >
> > Either way I also attached my dmesg.
> >
> > I am not sure, though, why the scroll mode still freezes if I move the my
> > fingers quickly on the touchpad while also using the trackpoint. Is that
> > maybe a future fix and this change is just the foundation for it? Overall
> > the usage of the trackpoint is better now for sure.
> >
> >
> >
> > ---
> > Thanks,
> >
> > Christopher Bachner
> >
> > On Mon, Jun 26, 2017 at 1:26 AM, Benjamin Tissoires <
> > benjamin.tissoires@...hat.com> wrote:
> >
> >> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> >>
> >> ---
> >>
> >> Hi Christopher,
> >>
> >> Could you please test this patch without appending synaptics_intertouch=1
> >> to the boot command line? If this still works, we will have the RMI4 over
> >> SMBus by default for your laptop.
> >>
> >> Cheers,
> >> Benjamin
> >>
> >> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> >> ---
> >>  drivers/input/mouse/synaptics.c | 1 +
> >>  1 file changed, 1 insertion(+)
> >>
> >> diff --git a/drivers/input/mouse/synaptics.c
> >> b/drivers/input/mouse/synaptics.c
> >> index f4fbe1a..a8fb26bc 100644
> >> --- a/drivers/input/mouse/synaptics.c
> >> +++ b/drivers/input/mouse/synaptics.c
> >> @@ -173,6 +173,7 @@ static const char * const smbus_pnp_ids[] = {
> >>         "LEN0046", /* X250 */
> >>         "LEN004a", /* W541 */
> >>         "LEN200f", /* T450s */
> >> +       "LEN2016", /* T460 20FN */
> >>         NULL
> >>  };
> >>
> >> --
> >> 2.9.4
> >>
> >>
> >