Ensure these steps are followed carefully. For additional protection, back up the registry before modification. See How to back up and restore the registry in Windows. The tunable registry values described below are all located in the touchpad device's HKR hardware key: Smoothmouse curve disable acceleration registry windows how to# Introduction to registry keys for drivers.Smoothmouse curve disable acceleration registry windows drivers# ![]() HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\PrecisionTouchPad On versions of Windows prior to version 1903, only the global location was supported. On Windows, version 1903 and later, each of the registry values in this guide is checked for under the HKR key first, and then under the HKEY_LOCAL_MACHINE key next. This enables the ability to override defaults from the HKR location on a per-value basis. Accidental Activation PreventionĪAP is a feature of Precision Touchpads that suppresses certain actions like mouse moves and taps for a short time after keyboarding events. The specific timeouts depend on the type of action and the region of the touchpad receiving input, as well as the user setting called Touchpad sensitivity found in Touchpad settings. More sensitive means less time is spent suppressing input after keyboarding events. Maximum sensitivity means AAP timeouts are zero and AAP is not in effect. This splits the touchpad into three regions: Windows defines two classes of "Curtain" regions on the touchpad to help prevent accidental input when users are resting their hands on the keyboard or touchpad during normal use. High sensitivity region: input suppression is minimal in this region.Curtain region: input may be suppressed for some time in this region.Supercurtain region: certain kinds of input like taps are almost always suppressed when the input originates with this regionĮven when specifying curtain sizes explicitly, it is strongly recommended to provide the physical touchpad positioning information via SpaceBarOffset and HorizontalOffset.This is necessary for Windows to make decisions around a consistent and predictable user experience when switching between keyboarding and pointing. For more information, see the Windows Precision Touchpad Device Integration guide. If the three values CurtainLeft, CurtainRight, and CurtainTop are found, Curtains will be constructed using these as distances from the respective edges. If all three of these values are not found, the legacy configuration (see Legacy Curtains below) will be used next, followed by defaults. The legacy algorithm for configuring curtains changes curtain sizes depending on the vertical location of touchpad event, and isn't as flexible for customization. ![]() The width of the region on either side of the center line (Zone Width in the diagram above) is defined as: The high sensnistivy region is intended to stay responsive even during or immediately after keybaord use Going forward, it is recommended that only SpaceBarOffset and HorizontalOffset values be set, and curtains be otherwise configured through CurtainTop.etc. Note that this means the total width of the region is twice this value. SpacebarOffset is taken into account for the region, since proximity to the keyboard increases risk of palm contact. ![]() Windows 8.1 , deprecated in Windows 10, version 1511 Windows 8.1 - Windows 10, version 1511 for 0 range, Windows 10, version 1511 for any range Distance to the top of the zone is defined as:ĪAPNonCurtainTop - SpaceBarOffset Registry Value The height of the region is defined in relation to the space bar and stretches to the bottom of the touchpad. Smoothmouse curve disable acceleration registry windows windows 8.1# The restricted sensitivity zone is the lowest sensitivity region of the touchpad. It is designed for the region of the touchpad where users would not leave fingers during intentional use. Note these are very small by default and should only be widened for very large devices. The top, left, and right zones' sizes are defined independently as a distance from their respective edge. ![]() They use the registry keys shown in the following table.
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