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

Have you had any other symptoms? I have now had two instances where the system totally froze and I can trace it to the same EC as the other issue. -- Advanced Applications Rod Barnes On Wed, Apr 15, 2026 at 11:42 AM Rod Barnes <advappsw@gmail.com> wrote: > I just had it happen again. I tried a USB keyboard and it does not > manifest this issue. evtest showed clearly that the USB keyboard is > working with no skipping but the internal keyboard is definitely skipping. > > -- > Advanced Applications > Rod Barnes > > > On Fri, Apr 10, 2026 at 1:22 PM Rod Barnes <advappsw@gmail.com> wrote: > >> Good to know; thank you. I suspected a USB keyboard would with fine since >> it uses a completely different set of hardware. >> >> My tests indicate it is the Embedded Controller (the EC, which emulates a >> i8042 chip for keyboard) that is the issue. I think the solution is a an >> upgrade to the EC firmware or maybe just the emulation layer. >> >> I've but had it happen again yet but once it does, I'll confirm with my >> USB keyboard and expect the same results as you. >> >> -- >> Advanced Applications >> Rod Barnes >> >> On Fri, Apr 10, 2026, 1:01 PM Cuchet Léo <2146485@bugs.launchpad.net> >> wrote: >> >>> Hello, >>> >>> I did not mention, I already tried a USB keyboard, and it works >>> flawlessly. >>> >>> The problem, in my case, applies only to the internal keyboard. >>> >>> Right now I am writing a repair request to Lenovo, and see if they know >>> about the problem, if it can be software or if it needs repair. >>> >>> I'll try to give you an update when possible. >>> >>> -- >>> You received this bug notification because you are subscribed to the bug >>> report. >>> 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 >>> >>> To manage notifications about this bug go to: >>> >>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2146485/+subscriptions >>> >>> >> >> -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2146485/+subscriptions