Hi there, I am using a Lenovo ThinkPad X1 Extreme Gen 4 (X1E4, 20Y5) that sporadically loses key-press events, i.e. no key is detected when pressing the key switch. Usually only single keys are missed, I have not experienced multiple lost consecutive key-press events. Lenovo has already swapped the keyboard, keyboard sub-card and mainboard, so I would rule out a hardware defect with high certainty (as only chassis, battery and screen are unchanged). The issue only happens when using the internal keyboard, using an external USB keyboard works flawlessly. I know two other users that experience the same issue. The X1E4 AFAIK accesses the keyboard via the i8042 driver. An older ThinkPad model (the X1E2) had a firmware/EC bug [1] that caused key-press events to be lost, so I can't completely rule out that Lenovo messed up the firmware implementation again. Affected systems: Lenovo ThinkPad X1 Extreme Gen 4 / P1 Gen 4 (Intel Tiger Lake H). Mine has a Core i7-11850H. uname -a Linux vega 5.17.5-arch1-1 #1 SMP PREEMPT Wed, 27 Apr 2022 20:56:11 +0000 x86_64 GNU/Linux Any ideas on how to troubleshoot this? Thanks, Thilo [1] https://www.notebookcheck.net/ThinkPad-X1-Extreme-Gen-2-Lenovo-fixes-the-keystrokes-bug.464923.0.html
