linux-kernel - PS/2 keyboard of laptop Dell XPS 13 9360 goes missing after S3

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Date: Thu, 18 Jan 2024 13:57:50 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: linux-input@...r.kernel.org, linux-pm@...r.kernel.org,
 Hans de Goede <hdegoede@...hat.com>, Dell.Client.Kernel@...l.com,
 regressions@...ts.linux.dev
Subject: PS/2 keyboard of laptop Dell XPS 13 9360 goes missing after S3

#regzbot introduced v6.6.11..v6.7

Dear Linux folks,

There seems to be a regression in Linux 6.7 on the Dell XPS 13 9360 
(Intel i7-7500U).

     [    0.000000] DMI: Dell Inc. XPS 13 9360/0596KF, BIOS 2.21.0 
06/02/2022

The PS/2 keyboard goes missing after S3 resume¹. The problem does not 
happen with Linux 6.6.11.

     [    1.435071] i8042: PNP: PS/2 Controller 
[PNP0303:PS2K,PNP0f13:PS2M] at 0x60,0x64 irq 1,12
     [    1.435409] i8042: Warning: Keylock active
     [    1.437624] serio: i8042 KBD port at 0x60,0x64 irq 1
     [    1.437631] serio: i8042 AUX port at 0x60,0x64 irq 12
     […]
     [    1.439743] input: AT Translated Set 2 keyboard as 
/devices/platform/i8042/serio0/input/input0

     $ sudo libinput list-devices
     […]
     Device:           AT Translated Set 2 keyboard
     Kernel:           /dev/input/event0
     Group:            15
     Seat:             seat0, default
     Capabilities:     keyboard
     Tap-to-click:     n/a
     Tap-and-drag:     n/a
     Tap drag lock:    n/a
     Left-handed:      n/a
     Nat.scrolling:    n/a
     Middle emulation: n/a
     Calibration:      n/a
     Scroll methods:   none
     Click methods:    none
     Disable-w-typing: n/a
     Disable-w-trackpointing: n/a
     Accel profiles:   n/a
     Rotation:         0.0

`libinput list-devices` does not list the device after resuming from S3. 
Some of the function keys, like brightness and airplane mode keys, still 
work, as the events are probably transmitted over the embedded 
controller or some other mechanism. An external USB keyboard also still 
works.

I haven’t had time to further analyze this, but wanted to report it. No idea

Kind regards,

Paul

¹ s2idle is not working correctly on the device, in the sense, that 
energy usage is very high in that state, and the full battery is at 20 % 
after leaving it for eight hours.
View attachment "20240117–dell-xps-13-9360–linux-6.7-messages--after-s3-no-laptop-keyboard.txt" of type "text/plain" (134353 bytes)