0001 What: /sys/devices/platform/i8042/.../sensitivity
0002 Date: Aug, 2005
0003 KernelVersion: 2.6.14
0004 Contact: linux-input@vger.kernel.org
0005 Description:
0006 (RW) Trackpoint sensitivity.
0007
0008 What: /sys/devices/platform/i8042/.../intertia
0009 Date: Aug, 2005
0010 KernelVersion: 2.6.14
0011 Contact: linux-input@vger.kernel.org
0012 Description:
0013 (RW) Negative inertia factor. High values cause the cursor to
0014 snap backward when the trackpoint is released.
0015
0016 What: /sys/devices/platform/i8042/.../reach
0017 Date: Aug, 2005
0018 KernelVersion: 2.6.14
0019 Contact: linux-input@vger.kernel.org
0020 Description:
0021 (RW) Backup range for z-axis press.
0022
0023 What: /sys/devices/platform/i8042/.../draghys
0024 Date: Aug, 2005
0025 KernelVersion: 2.6.14
0026 Contact: linux-input@vger.kernel.org
0027 Description:
0028 (RW) The drag hysteresis controls how hard it is to drag with
0029 z-axis pressed.
0030
0031 What: /sys/devices/platform/i8042/.../mindrag
0032 Date: Aug, 2005
0033 KernelVersion: 2.6.14
0034 Contact: linux-input@vger.kernel.org
0035 Description:
0036 (RW) Minimum amount of force needed to trigger dragging.
0037
0038 What: /sys/devices/platform/i8042/.../speed
0039 Date: Aug, 2005
0040 KernelVersion: 2.6.14
0041 Contact: linux-input@vger.kernel.org
0042 Description:
0043 (RW) Speed of the trackpoint cursor.
0044
0045 What: /sys/devices/platform/i8042/.../thresh
0046 Date: Aug, 2005
0047 KernelVersion: 2.6.14
0048 Contact: linux-input@vger.kernel.org
0049 Description:
0050 (RW) Minimum value for z-axis force required to trigger a press
0051 or release, relative to the running average.
0052
0053 What: /sys/devices/platform/i8042/.../upthresh
0054 Date: Aug, 2005
0055 KernelVersion: 2.6.14
0056 Contact: linux-input@vger.kernel.org
0057 Description:
0058 (RW) The offset from the running average required to generate a
0059 select (click) on z-axis on release.
0060
0061 What: /sys/devices/platform/i8042/.../ztime
0062 Date: Aug, 2005
0063 KernelVersion: 2.6.14
0064 Contact: linux-input@vger.kernel.org
0065 Description:
0066 (RW) This attribute determines how sharp a press has to be in
0067 order to be recognized.
0068
0069 What: /sys/devices/platform/i8042/.../jenks
0070 Date: Aug, 2005
0071 KernelVersion: 2.6.14
0072 Contact: linux-input@vger.kernel.org
0073 Description:
0074 (RW) Minimum curvature in degrees required to generate a double
0075 click without a release.
0076
0077 What: /sys/devices/platform/i8042/.../skipback
0078 Date: Aug, 2005
0079 KernelVersion: 2.6.14
0080 Contact: linux-input@vger.kernel.org
0081 Description:
0082 (RW) When the skipback bit is set, backup cursor movement during
0083 releases from drags will be suppressed. The default value for
0084 this bit is 0.
0085
0086 What: /sys/devices/platform/i8042/.../ext_dev
0087 Date: Aug, 2005
0088 KernelVersion: 2.6.14
0089 Contact: linux-input@vger.kernel.org
0090 Description:
0091 (RW) Disable (0) or enable (1) external pointing device.
0092
0093 What: /sys/devices/platform/i8042/.../press_to_select
0094 Date: Aug, 2005
0095 KernelVersion: 2.6.14
0096 Contact: linux-input@vger.kernel.org
0097 Description:
0098 (RW) Writing a value of 1 to this file will enable the Press to
0099 Select functions like tapping the control stick to simulate a
0100 left click, and writing 0 will disable it.
0101
0102 What: /sys/devices/platform/i8042/.../drift_time
0103 Date: Dec, 2014
0104 KernelVersion: 3.19
0105 Contact: linux-input@vger.kernel.org
0106 Description:
0107 (RW) This parameter controls the period of time to test for a
0108 ‘hands off’ condition (i.e. when no force is applied) before a
0109 drift (noise) calibration occurs.
0110
0111 IBM Trackpoints have a feature to compensate for drift by
0112 recalibrating themselves periodically. By default, if for 0.5
0113 seconds there is no change in position, it's used as the new
0114 zero. This duration is too low. Often, the calibration happens
0115 when the trackpoint is in fact being used.
