Messages in this thread |  | | Subject | Re: i8042 AUX port [serio1] suspend takes a second on Dell XPS 13 9360 | From | Paul Menzel <> | Date | Thu, 9 Jul 2020 10:50:02 +0200 |
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Dear Dmitry, dear Mario,
Am 21.02.18 um 10:22 schrieb Paul Menzel:
> Am 15.02.2018 um 16:22 schrieb Mario.Limonciello@dell.com: >>> -----Original Message----- >>> From: Paul Menzel [mailto:pmenzel+linux-input@molgen.mpg.de] >>> Sent: Thursday, February 15, 2018 2:26 AM >>> On 02/14/18 18:11, Mario.Limonciello@dell.com wrote: >>>> >>>>> -----Original Message----- >>>>> From: Paul Menzel [mailto:pmenzel+linux-input@molgen.mpg.de] >>>>> Sent: Wednesday, February 14, 2018 10:41 AM >>> >>>>> 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. >>>> >>>> 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. >>> >>>>> 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 didn’t work there >>> anymore. I was really sure, that I saw that problem once on the TUXEDO >>> device too, but must have been mistaken, that’s 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? >> >> It was like that before this laptop even launched to the market. >> It's been like that since way before 4.13. I want to say maybe >> 3.13ish is when >> I2C mode would come up instead. > > Indeed, analyzing the behavior on the current 8th generation Dell XPS 13 > 93*7*0 with the shipped Ubuntu with Linux 4.4.0-112-generic, the same > delay is visible. > >> The order of events goes something like this: >> 1) Touchpad is initially in PS2 mode >> 2) psmouse loads >> 3) It reports that it may be supportable by a different bus >> 4) The sequence to switch to I2C mode happens >> 5) i2c-hid and hid-multitouch get loaded >> 6) psmouse is no longer functional >> >> Dmitry is there a way that we can connect the two events? When >> i2c-hid finds >> the touchpad notify psmouse to unload or at least stop trying to >> access it to prevent >> the problem Paul is talking about with suspend? > > That would be great. Please tell me, if there is a bug tracker, where > this issue should reported to to track it.
The issue is still present with Linux 5.8-rc4. Does Mario’s plan sound feasible?
Kind regards,
Paul
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