linux-kernel - Re: i8042 AUX port [serio1] suspend takes a second on Dell XPS 13 9360 and TUXEDO Book 1406

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Message-ID: <a7c19320-4942-e41d-5323-0ac3693e7012@molgen.mpg.de>
Date:   Tue, 30 Jan 2018 19:39:32 +0100
From:   Paul Menzel <pmenzel+linux-input@...gen.mpg.de>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        it+linux-input@...gen.mpg.de
Subject: Re: i8042 AUX port [serio1] suspend takes a second on Dell XPS 13
 9360 and TUXEDO Book 1406

Dear Dmitry,


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.

Thank you for looking into this. Just to note, that it worked with Linux 
4.14.1 from Ubuntu 17.10, so it’s probably something in 4.15. Bisecting 
will take a bit, as the FTRACE stuff broke in Linux 4.15-rc1 and was 
only fixed in 4.15-rc9. Hopefully, it’s just one commit I need to 
backport. I’ll get back to you hopefully at the end of the week.


Kind regards,

Paul


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