A few days ago, the touchpad on my HP 2000 Notebook PC began acting up. It would jitter around a lot and insert phantom mouse clicks. My desktop ended up with approximately Avogadro’s number of Notes widgets. At first, I thought the touchpad was going bad. I resigned myself to a life of using a USB mouse, at least until I could buy a replacement.
As it turns out, though, it appears to be a software problem. On a whim, I opened up the KDE System Settings. When I selected “Touchpad” from the “Input Devices” menu, I saw a warning message that the saved settings did not match the current settings. Clicking “Apply” fixed…the glitch. Hopefully this helps if someone else comes across the issue. I didn’t file a bug because I don’t know what changed or how to reproduce it.