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

[Paul Menzel]

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 itâs 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, itâs just one commit I need to 
backport. Iâll get back to you hopefully at the end of the week.


Kind regards,

Paul

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