1 What: /sys/devices/platform/i8042/.../sensitivity 2 Date: Aug, 2005 3 KernelVersion: 2.6.14 4 Contact: linux-input@vger.kernel.org 5 Description: 6 (RW) Trackpoint sensitivity. 7 8 What: /sys/devices/platform/i8042/.../intertia 9 Date: Aug, 2005 10 KernelVersion: 2.6.14 11 Contact: linux-input@vger.kernel.org 12 Description: 13 (RW) Negative inertia factor. High values cause the cursor to 14 snap backward when the trackpoint is released. 15 16 What: /sys/devices/platform/i8042/.../reach 17 Date: Aug, 2005 18 KernelVersion: 2.6.14 19 Contact: linux-input@vger.kernel.org 20 Description: 21 (RW) Backup range for z-axis press. 22 23 What: /sys/devices/platform/i8042/.../draghys 24 Date: Aug, 2005 25 KernelVersion: 2.6.14 26 Contact: linux-input@vger.kernel.org 27 Description: 28 (RW) The drag hysteresis controls how hard it is to drag with 29 z-axis pressed. 30 31 What: /sys/devices/platform/i8042/.../mindrag 32 Date: Aug, 2005 33 KernelVersion: 2.6.14 34 Contact: linux-input@vger.kernel.org 35 Description: 36 (RW) Minimum amount of force needed to trigger dragging. 37 38 What: /sys/devices/platform/i8042/.../speed 39 Date: Aug, 2005 40 KernelVersion: 2.6.14 41 Contact: linux-input@vger.kernel.org 42 Description: 43 (RW) Speed of the trackpoint cursor. 44 45 What: /sys/devices/platform/i8042/.../thresh 46 Date: Aug, 2005 47 KernelVersion: 2.6.14 48 Contact: linux-input@vger.kernel.org 49 Description: 50 (RW) Minimum value for z-axis force required to trigger a press 51 or release, relative to the running average. 52 53 What: /sys/devices/platform/i8042/.../upthresh 54 Date: Aug, 2005 55 KernelVersion: 2.6.14 56 Contact: linux-input@vger.kernel.org 57 Description: 58 (RW) The offset from the running average required to generate a 59 select (click) on z-axis on release. 60 61 What: /sys/devices/platform/i8042/.../ztime 62 Date: Aug, 2005 63 KernelVersion: 2.6.14 64 Contact: linux-input@vger.kernel.org 65 Description: 66 (RW) This attribute determines how sharp a press has to be in 67 order to be recognized. 68 69 What: /sys/devices/platform/i8042/.../jenks 70 Date: Aug, 2005 71 KernelVersion: 2.6.14 72 Contact: linux-input@vger.kernel.org 73 Description: 74 (RW) Minimum curvature in degrees required to generate a double 75 click without a release. 76 77 What: /sys/devices/platform/i8042/.../skipback 78 Date: Aug, 2005 79 KernelVersion: 2.6.14 80 Contact: linux-input@vger.kernel.org 81 Description: 82 (RW) When the skipback bit is set, backup cursor movement during 83 releases from drags will be suppressed. The default value for 84 this bit is 0. 85 86 What: /sys/devices/platform/i8042/.../ext_dev 87 Date: Aug, 2005 88 KernelVersion: 2.6.14 89 Contact: linux-input@vger.kernel.org 90 Description: 91 (RW) Disable (0) or enable (1) external pointing device. 92 93 What: /sys/devices/platform/i8042/.../press_to_select 94 Date: Aug, 2005 95 KernelVersion: 2.6.14 96 Contact: linux-input@vger.kernel.org 97 Description: 98 (RW) Writing a value of 1 to this file will enable the Press to 99 Select functions like tapping the control stick to simulate a 100 left click, and writing 0 will disable it. 101 102 What: /sys/devices/platform/i8042/.../drift_time 103 Date: Dec, 2014 104 KernelVersion: 3.19 105 Contact: linux-input@vger.kernel.org 106 Description: 107 (RW) This parameter controls the period of time to test for a 108 ‘hands off’ condition (i.e. when no force is applied) before a 109 drift (noise) calibration occurs. 110 111 IBM Trackpoints have a feature to compensate for drift by 112 recalibrating themselves periodically. By default, if for 0.5 113 seconds there is no change in position, it's used as the new 114 zero. This duration is too low. Often, the calibration happens 115 when the trackpoint is in fact being used.
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