I cannot understand what's happening with my laptop keyboard. Occasionally, it becomes partially and very oddly unresponsive.
This has mostly been an issue at the lock screen. Keyboard input isn't registered, nor are mouse movements, so I cannot do anything to log back in. So okay, a hard shutdown and reboot, and the problem should be solved.
The part that doesn't make sense is that input 'works' if I'm holding down one of the modifier keys (either shift or ctrl, but I can't remember). Characters will show up in the password field, but something isn't working correctly, since the login fails. The modifier key + enter will submit the password, but Windows comes back with password incorrect.
Then just a few minutes ago, the same thing happened during normal use. Was resizing an image in paint (trivial, not taxing), and the keyboard/trackpad lock up. This time modifier keys don't help, but I am able to left/right click. Again, I can't actually do anything because the other inputs are not responding.
It doesn't seem like a hardware issue, since some of the key presses work under certain conditions. And it wasn't an issue with the entire system becoming unresponsive either. Any ideas?
It's a lenovo U260 running Windows 7, but I'm not sure if that makes much of a difference.
Similar thread, but slightly different conditions and unanswered. Filter Keys is off by default, not an issue in my case.