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1What: /sys/devices/platform/i8042/.../sensitivity2Date: Aug, 20053KernelVersion: 2.6.144Contact: linux-input@vger.kernel.org5Description:6 (RW) Trackpoint sensitivity.7 8What: /sys/devices/platform/i8042/.../intertia9Date: Aug, 200510KernelVersion: 2.6.1411Contact: linux-input@vger.kernel.org12Description:13 (RW) Negative inertia factor. High values cause the cursor to14 snap backward when the trackpoint is released.15 16What: /sys/devices/platform/i8042/.../reach17Date: Aug, 200518KernelVersion: 2.6.1419Contact: linux-input@vger.kernel.org20Description:21 (RW) Backup range for z-axis press.22 23What: /sys/devices/platform/i8042/.../draghys24Date: Aug, 200525KernelVersion: 2.6.1426Contact: linux-input@vger.kernel.org27Description:28 (RW) The drag hysteresis controls how hard it is to drag with29 z-axis pressed.30 31What: /sys/devices/platform/i8042/.../mindrag32Date: Aug, 200533KernelVersion: 2.6.1434Contact: linux-input@vger.kernel.org35Description:36 (RW) Minimum amount of force needed to trigger dragging.37 38What: /sys/devices/platform/i8042/.../speed39Date: Aug, 200540KernelVersion: 2.6.1441Contact: linux-input@vger.kernel.org42Description:43 (RW) Speed of the trackpoint cursor.44 45What: /sys/devices/platform/i8042/.../thresh46Date: Aug, 200547KernelVersion: 2.6.1448Contact: linux-input@vger.kernel.org49Description:50 (RW) Minimum value for z-axis force required to trigger a press51 or release, relative to the running average.52 53What: /sys/devices/platform/i8042/.../upthresh54Date: Aug, 200555KernelVersion: 2.6.1456Contact: linux-input@vger.kernel.org57Description:58 (RW) The offset from the running average required to generate a59 select (click) on z-axis on release.60 61What: /sys/devices/platform/i8042/.../ztime62Date: Aug, 200563KernelVersion: 2.6.1464Contact: linux-input@vger.kernel.org65Description:66 (RW) This attribute determines how sharp a press has to be in67 order to be recognized.68 69What: /sys/devices/platform/i8042/.../jenks70Date: Aug, 200571KernelVersion: 2.6.1472Contact: linux-input@vger.kernel.org73Description:74 (RW) Minimum curvature in degrees required to generate a double75 click without a release.76 77What: /sys/devices/platform/i8042/.../skipback78Date: Aug, 200579KernelVersion: 2.6.1480Contact: linux-input@vger.kernel.org81Description:82 (RW) When the skipback bit is set, backup cursor movement during83 releases from drags will be suppressed. The default value for84 this bit is 0.85 86What: /sys/devices/platform/i8042/.../ext_dev87Date: Aug, 200588KernelVersion: 2.6.1489Contact: linux-input@vger.kernel.org90Description:91 (RW) Disable (0) or enable (1) external pointing device.92 93What: /sys/devices/platform/i8042/.../press_to_select94Date: Aug, 200595KernelVersion: 2.6.1496Contact: linux-input@vger.kernel.org97Description:98 (RW) Writing a value of 1 to this file will enable the Press to99 Select functions like tapping the control stick to simulate a100 left click, and writing 0 will disable it.101 102What: /sys/devices/platform/i8042/.../drift_time103Date: Dec, 2014104KernelVersion: 3.19105Contact: linux-input@vger.kernel.org106Description:107 (RW) This parameter controls the period of time to test for a108 ‘hands off’ condition (i.e. when no force is applied) before a109 drift (noise) calibration occurs.110 111 IBM Trackpoints have a feature to compensate for drift by112 recalibrating themselves periodically. By default, if for 0.5113 seconds there is no change in position, it's used as the new114 zero. This duration is too low. Often, the calibration happens115 when the trackpoint is in fact being used.116