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

[Paul Menzel]

Dear Mario, dear Dmitry,


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

> On 02/14/18 18:11, Mario.Limonciello@xxxxxxxx wrote:
> > > -----Original Message-----
> > > From: Paul Menzel [mailto:pmenzel+linux-input@xxxxxxxxxxxxx]
> > > Sent: Wednesday, February 14, 2018 10:41 AM
> > > To: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> > > Cc: linux-input@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; it+linux-
> > > input@xxxxxxxxxxxxx; Limonciello, Mario <Mario_Limonciello@xxxxxxxx>;
> > > Thorsten Leemhuis <linux@xxxxxxxxxxxxx>
> > > 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
> > > > [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.
> >
> > 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 doesnât 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 didnât work there 
> anymore. I was really sure, that I saw that problem once on the TUXEDO 
> device too, but must have been mistaken, thatâs 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

Attachment: smime.p7s
Description: S/MIME Cryptographic Signature