自从我升级到 17.10 后，触摸板的敲击灵敏度太低，经常错过我的敲击。我知道系统已经发现我的 Lenovo Yoga 2 有一个 Synaptics 触摸板：
$ sudo evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
...
/dev/input/event6: Synaptics TM2714-001
...
但 xinput 并不认为它是 Synaptics 特有的：
$ xinput list
? Virtual core pointer id=2 [master pointer (3)]
? ? Virtual core XTEST pointer id=4 [slave pointer (2)]
? ? xwayland-pointer:13 id=6 [slave pointer (2)]
? ? xwayland-relative-pointer:13 id=7 [slave pointer (2)]
? ? xwayland-touch:13 id=9 [slave pointer (2)]
? Virtual core keyboard id=3 …