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The cap is red on ThinkPads, but is also found in other colors on other machines. Pointing sticks typically have a replaceable rubber cap, called a nub, which can be a slightly rough "eraser head" material or another shape. This pointing device has also appeared next to screens on compact-sized laptops such as the Toshiba Libretto and Sony VAIO UX. The mouse buttons can be operated right-handed or left-handed due to their placement below the keyboard along the centerline. On a QWERTY keyboard, the stick is typically embedded between the G, H and B keys, and the mouse buttons are placed just below the space bar. The relation between pressure and cursor or pointer speed can be adjusted, just as mouse speed is adjusted. The velocity of the pointer depends on the applied force so increasing pressure causes faster movement. A pointing stick can be used by pushing with the fingers in the general direction the user wants the cursor to move. The pointing stick senses applied force by using two pairs of resistive strain gauges. IBM introduced it commercially in 1992 on its laptops under the name "TrackPoint", patented in 1997. Unlike other pointing devices, it reacts to sustained force or strain rather than to gross movement, so it is called an "isometric" pointing device.

Like other pointing devices such as mice, touchpads or trackballs, operating system software translates manipulation of the device into movements of the pointer or cursor on the monitor. Being able to turn the touchpad on and off with a simple key combination makes the problem bearable while we wait for a better solution.IBM ThinkPad caps (left-to-right): Soft Dome, Soft Rim, Classic Dome, Eraser Head (discontinued)Ī pointing stick (or trackpoint, also referred to generically as a nub) is a small joystick used as a pointing device typically mounted centrally in a computer keyboard. Will disable the touchpad while xinput -set-prop "PS/2 Generic Mouse" "Device Enabled" 1 xinput -set-prop "PS/2 Generic Mouse" "Device Enabled" 0 If all you want is to be able to quickly and easily disable the touchpad so you can type, then try setting up keyboard shortcuts as follows. It also tells you how to do the patch if you feel brave enough to patch your kernel. The protocol has been mostly reverse engineered and there is now a fix involving a patched kernel module, but it isn't completely perfect (won't do multitouch) and hasn't yet found its way into the mainstream kernels. The failure to recognise the touchpad and fallback to identifying it as a PS2 mouse is due to the hardware using a new protocol and the manufacturer not releasing the specs so that a free driver can be written.