I am using ThinkPad T470s with KDE Plasma 5 on openSUSE Tumbleweed (almost always the latest snapshot). The mouse wheel scrolling feature intermittently stops working for a while if the touchpad is enabled. This has happened to Firefox ESR version 52, and Firefox 54 and 55. So it has been a long time and I am getting to know how to minimise the annoyance. When the mouse wheel scrolling not working, it cannot scroll the webpage up and down, as well as the tabs list on the tab bar. However, the left and right buttons work well and mouse wheel works fine in other windows such as Dolphin and Kate. Then, if using the touchpad instead to perform a two-finger scrolling, the scroll speed is much slower than normal, and it gets slow and slow in the following less-than-a-minute time. Then the touchpad two-finger scroll stops working, too. After a while, approximately several minutes, both the mouse wheel scrolling and the touchpad two-finger scrolling get back to normal. But, when the the mouse wheel scrolling stops working, if I disable the touchpad, then it gets normal almost immediately. So, the questions are, 1. Has anyone else runs into this? 2. What is the problem and how to fix it? 3. If no one knows why and no other person has it, how do I debug this? Maybe another thing I should mention is that I refreshed my Firefox 55.0.1 the night before yesterday. It still has this issue even under such a fresh state without any custom setting and add-on. Any help is appreciated.