For quite some time, I was annoyed by those pop-up notifications that showed the Caps Lock key status. Sometimes, the OSD would even steal focus from a game, making it feel like I had just pressed Alt+Tab.
I was convinced this was caused by one of Lenovo’s laptop utilities, but after digging through every possible setting, I found nothing. Next, I turned to Lenovo user forums, yet all the recommended fixes there failed as well. I tried everything: disabling the Fn key service, tweaking registry settings, killing Lenovo Vantage processes, changing Accessibility Options—you name it. Nothing worked!
Then I remembered the brilliant SysInternals toolkit. Among its tools is Process Explorer, which has an extremely useful feature: identifying the process behind a window with just a mouse click.
And there it was—the culprit! It turned out to be Dell Display and Peripheral Manager. Honestly, at some point, I had already started cursing Lenovo, but as it turned out, they weren’t to blame at all.
In Display Manager, there’s a settings block where you can simply uncheck the option Keyboard lock key under the General section—and that’s it! Problem solved.