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Subject: Re: i8042 AUX port [serio1] suspend takes a second on Dell XPS 13
 9360
To:     Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc:     linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
        it+linux-input@molgen.mpg.de,
        Mario Limonciello <mario.limonciello@dell.com>,
        Thorsten Leemhuis <linux@leemhuis.info>
References: <5a74e1a7-2083-c6b2-f51a-f44908ac8bc4@molgen.mpg.de>
 <20180130175017.72inurhk5l7tcvae@dtor-ws>
 <20180130180736.ehucqywbz7zdl4v7@dtor-ws>
From:   Paul Menzel <pmenzel+linux-input@molgen.mpg.de>
Message-ID: <f02b699d-b130-c09f-3e09-db62ecf2df2c@molgen.mpg.de>
Date:   Wed, 14 Feb 2018 17:41:29 +0100
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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], the=
re is a
>>> regression, that i8042 AUX port [serio1] suspend takes a second on De=
ll XPS
>>> 13 9360 and TUXEDO Book 1406.
>>
>> It would be really helpful to know when the regression started.
>=20
> 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:
>=20
> [   94.591636] calling  serio1+ @ 2299, parent: i8042
> [   94.794292] psmouse serio1: Failed to disable mouse on isa0060/serio=
1
> [   95.593303] call serio1+ returned 0 after 974280 usecs
>=20
> 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 your replies. First of all, it looks like *only* the Dell=20
system is effected as I was unable to reproduce it on the TUXEDO Book=20
1406. I have to verify that by finding old log files.

Starting the bisect between 4.14 and 4.15-rc1 it turns out, that the=20
problem is also reproducible with 4.14, and I remembered wrong. Looking=20
more into it, I could also reproduce it with Linux 4.13.0-32-generic=20
from Ubuntu 16.04 (Hardware Enablement Stack). But my old logs do not=20
show the problem. As the UEFI firmware was updated to version 2.5.0 in=20
the meantime, it could also be related to that.

So it turns out, with 4.16-rc1 I see this delay/failure message only=20
during the first suspend. Suspending a second time, I do not see the=20
message.

Any hints how to debug this further are much appreciated. Could it be=20
related to the embedded controller?


Kind regards,

Paul


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