[Bug 2146485] Re: IdeaPad Slim 5 16AKP10 (83HY): intermittent keyboard keystroke drops at i8042 kernel driver level

Hello,

Unfortunately, I already am running the latest version of the BIOS
(R0CN27WW).

I checked BIOS historical modification from their Readme file, but it
doesn't specify any modifications about keyboard behaviour in the EC
Firmware part.

I think I'll end up contacting Lenovo support directly, and hope they
have a fix for it.

But still, thank you for trying to help !

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https://bugs.launchpad.net/bugs/2146485

Title:
IdeaPad Slim 5 16AKP10 (83HY): intermittent keyboard keystroke drops
at i8042 kernel driver level

Status in linux package in Ubuntu:
Confirmed

Bug description:
On a Lenovo IdeaPad Slim 5 16AKP10 (model 83HY), the built-in keyboard
intermittently begins dropping keystrokes after a variable uptime
(sometimes hours, sometimes days). The issue clears on reboot and does
not persist across power cycles.

Hardware:
System: Lenovo IdeaPad Slim 5 16AKP10 (83HY)
BIOS: R0CN22WW
OS: Linux Mint 22.3
Kernel: 6.17.0-14-generic and 6.17.0-19-generic (issue present on both)

Diagnosis:
evtest confirms keystroke drops are occurring at the kernel input driver level, not in X11 or the compositor

dmesg shows no i8042 errors during affected sessions

/proc/interrupts shows normal i8042 interrupt counts during the
problem

Memory, swap, CPU load, and thermals are all normal during affected
sessions

The i8042 module is built-in and cannot be reloaded to recover without
a full reboot

Boot parameter i8042.nopnp (added based on kernel warning at boot:
"PS/2 appears to have AUX port disabled, if this is incorrect please
boot with i8042.nopnp") improved perceived keyboard latency but did
not prevent recurrence of drops

TLP 1.6.1 is installed and manages power; forcing USB autosuspend to
"on" during an affected session did not resolve the issue

$ cat /proc/interrupts | grep i8042
1: 0 28512 0 0 0 0 0 0 0 0 0 0 0 0 0 0 IR-IO-APIC 1-edge i8042

Kernel boot messages:
i8042: PNP detection disabled
serio: i8042 KBD port at 0x60,0x64 irq 1
input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input2
Current kernel cmdline:
quiet splash kvm.enable_virt_at_load=0 i8042.nopnp

Expected behavior: Keyboard input should be reliable throughout a
session without requiring a reboot to restore normal function.

Workaround: Reboot restores normal keyboard function until the issue
recurs.

Possibly significant point: I am a fast typist but I experience this
even when typing very slowly.

Attached archive contains:
$ cat /proc/version_signature > ~/version.log
$ sudo lspci -vnvn > ~/lspci-vnvn.log
$ sudo dmesg > ~/dmesg.log
$ cat /proc/interrupts > ~/interrupts.log

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