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

[Paul Menzel]

Dear Dmitry,


Am 30.01.2018 um 19:39 schrieb Paul Menzel:

> 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
> > [ÂÂ 94.794292] psmouse serio1: Failed to disable mouse on isa0060/serio1
> > [ÂÂ 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.

Unfortunately, I am unable to reproduce it currently. Also not with the 
original Linux kernel versions I tried. Iâll report back, when I see it 
the next time.


Kind regards,

Paul