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SubjectRE: [PATCH 0/8] Input: support for latest Lenovo thinkpads (series 80)
Hi Benjamin,

Thanks so much for your patch.

I have tested them for Elan Gen5/Gen6(new) touchpad with SMbus/PS2.
It works fine in my thinkpad so far but I find an issue today after lid-close/open.

I am not sure if you can see it in T480S , I "guess" it may be relative to i2c_i801.

The lid-close will enter deep sleep and cut touchpad power.
I can see the resume flow after lid-open and SMbus-initial try to request hello package but fail.
Strangely, I can't see any SMbus host signal on LA scope after power-on.

I can't switch to SMbus after rmmod/modprobe psmouse because error happen in elantech_create_smbus.
It will be recovered only if I rmmod/modprobe i2c_i801 first.

Do you have any idea about it?

-----Original Message-----
From: Benjamin Tissoires []
Sent: Friday, April 06, 2018 2:51 PM
To: Dmitry Torokhov
Cc: 廖崇榮; Oliver Haessler; Benjamin Berg; open list:HID CORE LAYER; lkml
Subject: Re: [PATCH 0/8] Input: support for latest Lenovo thinkpads (series 80)

Hi Dmitry,

On Fri, Apr 6, 2018 at 1:51 AM, Dmitry Torokhov <> wrote:
> Hi Benjamin,
> On Thu, Apr 05, 2018 at 03:25:29PM +0200, Benjamin Tissoires wrote:
>> Hi Dmitry,
>> well, this year, Lenovo gave us a surprise and decided to not use the
>> same touchpad/trackstick in all its model. And by default, the
>> support under Linux is less than ideal.
>> Please find a series that should fix those issues. Compared to the 60
>> series, there do not seem to e BIOS table issues this time, and
>> suspend/resume works fine thanks to your latest trackstick fixes.
>> The T480s is a different beast, as it uses an Elan touchpad.
>> I have been carrying the patches 3-6 for a while and tested previous
>> versions on various Elan PS/2 hardware without an issue as far as I
>> could tell. I was lacking tests from users with SMBus as all the
>> laptops I tried where puer PS/2.
>> Anyway, it would be cool if you could have a look at the series.
> I am mostly happy with the series, but I would love to hear KT's take
> on it.

thanks for the quick review.
I worked closely with KT for this series. He helped me a lot for the tiny firmware changes that were required. However, quoting his email from Tuesday:
"There will be a spring vacation in Taiwan from tomorrow." I guess we won't hear from him until the end of next week as we always have a backlog of urgent things to do after holidays...


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