linux-kernel - Re: i8042 AUX port [serio1] suspend takes a second on Dell XPS 13 9360

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Date:   Thu, 15 Feb 2018 09:40:19 +0100
From:   Paul Menzel <pmenzel+linux-input@...gen.mpg.de>
To:     Mario Limonciello <mario.limonciello@...l.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        it+linux-input@...gen.mpg.de, linux@...mhuis.info
Subject: Re: i8042 AUX port [serio1] suspend takes a second on Dell XPS 13
 9360

Dear Mario, dear Dmitry,


On 02/15/18 09:26, Paul Menzel wrote:

> On 02/14/18 18:11, Mario.Limonciello@...l.com wrote:
>>
>>
>>> -----Original Message-----
>>> From: Paul Menzel [mailto:pmenzel+linux-input@...gen.mpg.de]
>>> Sent: Wednesday, February 14, 2018 10:41 AM
>>> To: Dmitry Torokhov <dmitry.torokhov@...il.com>
>>> Cc: linux-input@...r.kernel.org; linux-kernel@...r.kernel.org; it+linux-
>>> input@...gen.mpg.de; Limonciello, Mario <Mario_Limonciello@...l.com>;
>>> Thorsten Leemhuis <linux@...mhuis.info>
>>> Subject: Re: i8042 AUX port [serio1] suspend takes a second on Dell 
>>> XPS 13 9360
> 
>>> On 01/30/18 19:07, Dmitry Torokhov wrote:
>>>> On Tue, Jan 30, 2018 at 09:52:45AM -0800, Dmitry Torokhov wrote:
>>>
>>>>> On Tue, Jan 30, 2018 at 06:36:34PM +0100, Paul Menzel wrote:
>>>
>>>>>> I do not know, when it started, but with Linux 4.14-rc8 and 4.15,
>>>>>> benchmarking suspend and resume time with `sleepgraph.py` [1][2], 
>>>>>> there is a
>>>>>> regression, that i8042 AUX port [serio1] suspend takes a second on 
>>>>>> Dell XPS
>>>>>> 13 9360 and TUXEDO Book 1406.
>>>>>
>>>>> It would be really helpful to know when the regression started.
>>>>
>>>> So the reason it takes longer is because the touchpad does not want to
>>>> talk to us for some reason and we wait until commands time out:
>>>>
>>>> [   94.591636] calling  serio1+ @ 2299, parent: i8042
>>>> [   94.794292] psmouse serio1: Failed to disable mouse on 
>>>> isa0060/serio1
>>>> [   95.593303] call serio1+ returned 0 after 974280 usecs
>>>>
>>>> but it is not clear why it happens, I do not think we changed anything
>>>> in that path for a while, so it might be some other change affecting
>>>> things indirectly. I'm afraid you'll have to narrow the scope, and
>>>> ideally bisect.
>>
>> Please keep in mind the XPS 9360 has a touchpad that can operate in I2C
>> or PS2 modes.  It's connected to both buses and with the right 
>> initialization
>> sequence will come up in I2C mode.
>>
>> Assuming Paul M. has compiled and used hid-multitouch and i2c-hid the
>> touchpad should be operating in I2C mode.
>>
>> When this happens I expect that the touchpad shouldn't be responding
>> to PS2 commands.
>>
>> As a debugging tactic, you may consider to unload psmouse before
>> suspend and still see the touchpad operational.
> 
> Thank you! Unloading *psmouse* with `sudo modprobe -r psmouse` indeed 
> worked on the Dell XPS 13 9360, that means, the cursor is still 
> functioning.

But to clarify, the TUXEDO device can be booted with 
`psmouse.synaptics_intertouch=1`, and the cursor still works. (I am 
going to send a patch.) So the EC(?) on the TUXEDO device seems to 
support PS2 and I2C modes, and doesn’t show the same problems as the 
Dell device.

>>> Thank you for your replies. First of all, it looks like *only* the Dell
>>> system is effected as I was unable to reproduce it on the TUXEDO Book
>>> 1406. I have to verify that by finding old log files.
>>
>> Does this other laptop you are drawing a comparison to also have a
>> touchpad that can operate in multiple modes?
>>
>> To make an accurate comparison you should determine what mode it's in.
> 
> Yeah, removing the module *psmouse*, the cursor didn’t work there 
> anymore. I was really sure, that I saw that problem once on the TUXEDO 
> device too, but must have been mistaken, that’s why I corrected it. 
> Sorry for the misunderstanding.
> 
> So, why does *psmouse* get loaded on the Dell XPS 13 9360 since at least 
> Linux 4.13? Or where the modules added causing the touchpad to operate 
> in I2C mode, which causes PS2 to stop to work?
> 
> Please find the full Linux kernel messages attached.

Starting the system with `psmouse.synaptics_intertouch=1`, the one 
second delay is still reproducible.


Kind regards,

Paul


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