Date:   Tue, 28 Dec 2021 08:29:40 +0100
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Jiri Kosina <jkosina@...e.cz>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        casteyde.christian@...e.fr
Subject: [regression] Touchpad is not working after suspend to RAM since
 kernel 5.14 (fwd from b.k.o bug 214667)

Hi, this is your Linux kernel regression tracker speaking.

Forwarding a regression reported by Christian Casteyde (CCed) in
bugzilla.kernel.org which apparently has fallen through the cracks.

https://bugzilla.kernel.org/show_bug.cgi?id=214667

A few quotes from comments in the ticket:

> Since Kernel 5.14 (probably 5.14-rc5 indeed) the touchpad does not
> work anymore after resume from suspend to RAM. Was working with 5.13
> kernel.
> 
> I've bisected the bug, first bad commit is: 
> b3e29642548258c7cd2cb3326a776fff84cd6b69 is the first bad commit
> 
> SC[33mcommit b3e29642548258c7cd2cb3326a776fff84cd6b69ESC[m Merge:
> 8f4ef88 498d0dd Author: Jiri Kosina <jkosina@...e.cz> Date:   Wed Jun
> 30 09:15:15 2021 +0200
> 
> Merge branch 'for-5.14/multitouch' into for-linus
> 
> - patch series that ensures that hid-multitouch driver disables touch
> and button-press reporting on hid-mt devices during suspend when the
> device is not configured as a wakeup-source, from Hans de Goede
> 
> Seem to be related with the observed behaviour.

Yes, that's a merge, but it contains code changes, maybe something went
wrong there.

> Update with kernel 5.15-rc7
> 
> Still present. However, I noticed dmesg ouput interesting messages
> telling there is a transfer from the ELAN touchpad while suspended,
> it failed to suspend, then failed to resume. The interesting thing is
> if I try to suspend a second time, at resume the touchpad manages to
> resume. Appending dmesg output for reference.


> The problem is still present in 5.16-rc7, but indeed it got worse
> (and indeed is now critical). a) After the first "suspend" tentative
> (closing the lid), the laptop doesn't suspend (only the screen is
> blanked) b) When I reopen the lid, the touchpad stays disabled c)
> When I try to suspend a second time (closing the lid), the system
> totally freeze (without any info in dmesg) and I need to reset it
> totally. I'll open a separate bug report for this one, when bisected,
> and will try to post it to the suspend maintainer together with the
> mailing list (I'm not accustomed to mailing lists).

FWIW, Christian did this here:
https://lore.kernel.org/all/256689953.114854578.1640622738334.JavaMail.root@zimbra40-e7.priv.proxad.net/

> FYI, if I remember well, reverting this single commit fixed the issue
> and the diff was making sense (try to disable the touchpad before
> going to sleep to prevent unexpected event from it while
> suspending... if I understood well the code).

To be sure this issue doesn't again fall through the cracks unnoticed,
I'm adding it to regzbot, my Linux kernel regression tracking bot:

#regzbot introduced b3e29642548258c7cd2cb3326a776fff84cd6b69ESC
#regzbot title hid: touchpad is not working after suspend to RAM
#regzbot from: Christian Casteyde <casteyde.christian@...e.fr>
#regzbot ignore-activity

Reminder: when fixing the issue, please add a 'Link:' tag with the URL
to the report (the parent of this mail) using the kernel.org redirector,
as explained in 'Documentation/process/submitting-patches.rst'. Regzbot
then will automatically mark the regression as resolved once the fix
lands in the appropriate tree. For more details about regzbot see footer.

Sending this to everyone that got the initial report, to make all aware
of the tracking. I also hope that messages like this motivate people to
directly get at least the regression mailing list and ideally even
regzbot involved when dealing with regressions, as messages like this
wouldn't be needed then.

Don't worry, I'll send further messages wrt to this regression just to
the lists (with a tag in the subject so people can filter them away), as
long as they are intended just for regzbot. With a bit of luck no such
messages will be needed anyway.



Ciao, Thorsten (wearing his 'Linux kernel regression tracker' hat).

P.S.: As a Linux kernel regression tracker I'm getting a lot of reports
on my table. I can only look briefly into most of them. Unfortunately
therefore I sometimes will get things wrong or miss something important.
I hope that's not the case here; if you think it is, don't hesitate to
tell me about it in a public reply. That's in everyone's interest, as
what I wrote above might be misleading to everyone reading this; any
suggestion I gave thus might sent someone reading this down the wrong
rabbit hole, which none of us wants.

BTW, I have no personal interest in this issue, which is tracked using
regzbot, my Linux kernel regression tracking bot
(https://linux-regtracking.leemhuis.info/regzbot/). I'm only posting
this mail to get things rolling again and hence don't need to be CC on
all further activities wrt to this regression.

---
Additional information about regzbot:

If you want to know more about regzbot, check out its web-interface, the
getting start guide, and/or the references documentation:

https://linux-regtracking.leemhuis.info/regzbot/
https://gitlab.com/knurd42/regzbot/-/blob/main/docs/getting_started.md
https://gitlab.com/knurd42/regzbot/-/blob/main/docs/reference.md

The last two documents will explain how you can interact with regzbot
yourself if your want to.

Hint for reporters: when reporting a regression it's in your interest to
tell #regzbot about it in the report, as that will ensure the regression
gets on the radar of regzbot and the regression tracker. That's in your
interest, as they will make sure the report won't fall through the
cracks unnoticed.

Hint for developers: you normally don't need to care about regzbot once
it's involved. Fix the issue as you normally would, just remember to
include a 'Link:' tag to the report in the commit message, as explained
in Documentation/process/submitting-patches.rst
That aspect was recently was made more explicit in commit 1f57bd42b77c:
https://git.kernel.org/linus/1f57bd42b77c

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