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

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Date:   Tue, 27 Jun 2017 09:53:05 +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, Benjamin Tissoires wrote:
> 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 :(

Could you try applying Lyude's patch: http://patchwork.ozlabs.org/patch/780865/
(on top of mine, of course).

In the dmesg, you should see a Synaptics TMXXXX device appearing after
trying to set up the SMBus companion.

Cheers,
Benjamin