1 What: /sys/devices/platform/i8042/.. 1 What: /sys/devices/platform/i8042/.../sensitivity
2 Date: Aug, 2005 2 Date: Aug, 2005
3 KernelVersion: 2.6.14 3 KernelVersion: 2.6.14
4 Contact: linux-input@vger.kernel.org 4 Contact: linux-input@vger.kernel.org
5 Description: 5 Description:
6 (RW) Trackpoint sensitivity. 6 (RW) Trackpoint sensitivity.
7 7
8 What: /sys/devices/platform/i8042/.. 8 What: /sys/devices/platform/i8042/.../intertia
9 Date: Aug, 2005 9 Date: Aug, 2005
10 KernelVersion: 2.6.14 10 KernelVersion: 2.6.14
11 Contact: linux-input@vger.kernel.org 11 Contact: linux-input@vger.kernel.org
12 Description: 12 Description:
13 (RW) Negative inertia factor. 13 (RW) Negative inertia factor. High values cause the cursor to
14 snap backward when the trackpo 14 snap backward when the trackpoint is released.
15 15
16 What: /sys/devices/platform/i8042/.. 16 What: /sys/devices/platform/i8042/.../reach
17 Date: Aug, 2005 17 Date: Aug, 2005
18 KernelVersion: 2.6.14 18 KernelVersion: 2.6.14
19 Contact: linux-input@vger.kernel.org 19 Contact: linux-input@vger.kernel.org
20 Description: 20 Description:
21 (RW) Backup range for z-axis p 21 (RW) Backup range for z-axis press.
22 22
23 What: /sys/devices/platform/i8042/.. 23 What: /sys/devices/platform/i8042/.../draghys
24 Date: Aug, 2005 24 Date: Aug, 2005
25 KernelVersion: 2.6.14 25 KernelVersion: 2.6.14
26 Contact: linux-input@vger.kernel.org 26 Contact: linux-input@vger.kernel.org
27 Description: 27 Description:
28 (RW) The drag hysteresis contr 28 (RW) The drag hysteresis controls how hard it is to drag with
29 z-axis pressed. 29 z-axis pressed.
30 30
31 What: /sys/devices/platform/i8042/.. 31 What: /sys/devices/platform/i8042/.../mindrag
32 Date: Aug, 2005 32 Date: Aug, 2005
33 KernelVersion: 2.6.14 33 KernelVersion: 2.6.14
34 Contact: linux-input@vger.kernel.org 34 Contact: linux-input@vger.kernel.org
35 Description: 35 Description:
36 (RW) Minimum amount of force n 36 (RW) Minimum amount of force needed to trigger dragging.
37 37
38 What: /sys/devices/platform/i8042/.. 38 What: /sys/devices/platform/i8042/.../speed
39 Date: Aug, 2005 39 Date: Aug, 2005
40 KernelVersion: 2.6.14 40 KernelVersion: 2.6.14
41 Contact: linux-input@vger.kernel.org 41 Contact: linux-input@vger.kernel.org
42 Description: 42 Description:
43 (RW) Speed of the trackpoint c 43 (RW) Speed of the trackpoint cursor.
44 44
45 What: /sys/devices/platform/i8042/.. 45 What: /sys/devices/platform/i8042/.../thresh
46 Date: Aug, 2005 46 Date: Aug, 2005
47 KernelVersion: 2.6.14 47 KernelVersion: 2.6.14
48 Contact: linux-input@vger.kernel.org 48 Contact: linux-input@vger.kernel.org
49 Description: 49 Description:
50 (RW) Minimum value for z-axis 50 (RW) Minimum value for z-axis force required to trigger a press
51 or release, relative to the ru 51 or release, relative to the running average.
52 52
53 What: /sys/devices/platform/i8042/.. 53 What: /sys/devices/platform/i8042/.../upthresh
54 Date: Aug, 2005 54 Date: Aug, 2005
55 KernelVersion: 2.6.14 55 KernelVersion: 2.6.14
56 Contact: linux-input@vger.kernel.org 56 Contact: linux-input@vger.kernel.org
57 Description: 57 Description:
58 (RW) The offset from the runni 58 (RW) The offset from the running average required to generate a
59 select (click) on z-axis on re 59 select (click) on z-axis on release.
60 60
61 What: /sys/devices/platform/i8042/.. 61 What: /sys/devices/platform/i8042/.../ztime
62 Date: Aug, 2005 62 Date: Aug, 2005
63 KernelVersion: 2.6.14 63 KernelVersion: 2.6.14
64 Contact: linux-input@vger.kernel.org 64 Contact: linux-input@vger.kernel.org
65 Description: 65 Description:
66 (RW) This attribute determines 66 (RW) This attribute determines how sharp a press has to be in
67 order to be recognized. 67 order to be recognized.
68 68
69 What: /sys/devices/platform/i8042/.. 69 What: /sys/devices/platform/i8042/.../jenks
70 Date: Aug, 2005 70 Date: Aug, 2005
71 KernelVersion: 2.6.14 71 KernelVersion: 2.6.14
72 Contact: linux-input@vger.kernel.org 72 Contact: linux-input@vger.kernel.org
73 Description: 73 Description:
74 (RW) Minimum curvature in degr 74 (RW) Minimum curvature in degrees required to generate a double
75 click without a release. 75 click without a release.
76 76
77 What: /sys/devices/platform/i8042/.. 77 What: /sys/devices/platform/i8042/.../skipback
78 Date: Aug, 2005 78 Date: Aug, 2005
79 KernelVersion: 2.6.14 79 KernelVersion: 2.6.14
80 Contact: linux-input@vger.kernel.org 80 Contact: linux-input@vger.kernel.org
81 Description: 81 Description:
82 (RW) When the skipback bit is 82 (RW) When the skipback bit is set, backup cursor movement during
83 releases from drags will be su 83 releases from drags will be suppressed. The default value for
84 this bit is 0. 84 this bit is 0.
85 85
86 What: /sys/devices/platform/i8042/.. 86 What: /sys/devices/platform/i8042/.../ext_dev
87 Date: Aug, 2005 87 Date: Aug, 2005
88 KernelVersion: 2.6.14 88 KernelVersion: 2.6.14
89 Contact: linux-input@vger.kernel.org 89 Contact: linux-input@vger.kernel.org
90 Description: 90 Description:
91 (RW) Disable (0) or enable (1) 91 (RW) Disable (0) or enable (1) external pointing device.
92 92
93 What: /sys/devices/platform/i8042/.. 93 What: /sys/devices/platform/i8042/.../press_to_select
94 Date: Aug, 2005 94 Date: Aug, 2005
95 KernelVersion: 2.6.14 95 KernelVersion: 2.6.14
96 Contact: linux-input@vger.kernel.org 96 Contact: linux-input@vger.kernel.org
97 Description: 97 Description:
98 (RW) Writing a value of 1 to t 98 (RW) Writing a value of 1 to this file will enable the Press to
99 Select functions like tapping 99 Select functions like tapping the control stick to simulate a
100 left click, and writing 0 will 100 left click, and writing 0 will disable it.
101 101
102 What: /sys/devices/platform/i8042/.. 102 What: /sys/devices/platform/i8042/.../drift_time
103 Date: Dec, 2014 103 Date: Dec, 2014
104 KernelVersion: 3.19 104 KernelVersion: 3.19
105 Contact: linux-input@vger.kernel.org 105 Contact: linux-input@vger.kernel.org
106 Description: 106 Description:
107 (RW) This parameter controls t 107 (RW) This parameter controls the period of time to test for a
108 ‘hands off’ condition (i.e 108 ‘hands off’ condition (i.e. when no force is applied) before a
109 drift (noise) calibration occu 109 drift (noise) calibration occurs.
110 110
111 IBM Trackpoints have a feature 111 IBM Trackpoints have a feature to compensate for drift by
112 recalibrating themselves perio 112 recalibrating themselves periodically. By default, if for 0.5
113 seconds there is no change in 113 seconds there is no change in position, it's used as the new
114 zero. This duration is too low 114 zero. This duration is too low. Often, the calibration happens
115 when the trackpoint is in fact 115 when the trackpoint is in fact being used.
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