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PS/2 (i8042prt) driver – Windows drivers | Microsoft Docs
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- Summary of article content: Articles about PS/2 (i8042prt) driver – Windows drivers | Microsoft Docs [Key: HKLM\SYSTEM\CurrentControlSet\Services\i8042prt\Parameters]. EnableWheelDetection [REG_DWORD] – Determines whether the driver attempts … …
- Most searched keywords: Whether you are looking for PS/2 (i8042prt) driver – Windows drivers | Microsoft Docs [Key: HKLM\SYSTEM\CurrentControlSet\Services\i8042prt\Parameters]. EnableWheelDetection [REG_DWORD] – Determines whether the driver attempts … This topic describes the features of I8042prt, the Microsoft Windows 2000 and later system function driver for PS/2-style keyboard and mouse devices.
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Why, after I updated my keyboard driver to the new Microsoft Natural Keyboard Pro driver, did my keyboard and mouse stop working? | ITPro Today: IT News, How-Tos, Trends, Case Studies, Career Tips, More
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- Summary of article content: Articles about Why, after I updated my keyboard driver to the new Microsoft Natural Keyboard Pro driver, did my keyboard and mouse stop working? | ITPro Today: IT News, How-Tos, Trends, Case Studies, Career Tips, More The i8042 service must be running for a PS/2 keyboard and mouse to … Change HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt\Start to 1 … …
- Most searched keywords: Whether you are looking for Why, after I updated my keyboard driver to the new Microsoft Natural Keyboard Pro driver, did my keyboard and mouse stop working? | ITPro Today: IT News, How-Tos, Trends, Case Studies, Career Tips, More The i8042 service must be running for a PS/2 keyboard and mouse to … Change HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt\Start to 1 …
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hkey_local_machine system currentcontrolset services i8042prt
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- Summary of article content: Articles about hkey_local_machine system currentcontrolset services i8042prt Group: Keyboard Port. Path: %SystemRoot%\System32\drivers\i8042prt.sys. Registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt … …
- Most searched keywords: Whether you are looking for hkey_local_machine system currentcontrolset services i8042prt Group: Keyboard Port. Path: %SystemRoot%\System32\drivers\i8042prt.sys. Registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt …
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Windows Registry modification help needed.(i8042prt) | Windows 8 Help Forums
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- Summary of article content: Articles about Windows Registry modification help needed.(i8042prt) | Windows 8 Help Forums PS/2 keyboard devices are governed by a kernel-level service called … HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt? …
- Most searched keywords: Whether you are looking for Windows Registry modification help needed.(i8042prt) | Windows 8 Help Forums PS/2 keyboard devices are governed by a kernel-level service called … HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt? Hello,
My friend had an issue with his PS/2 keyboard, the Num Lock light was on,keyboard was recognized in BIOS, but not recognized in Windows 8, so I was… - Table of Contents:
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Registry patch to change keyboard layout to 101-en-us · GitHub
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- Summary of article content: Articles about Registry patch to change keyboard layout to 101-en-us · GitHub Windows Registry Editor Version 5.00. [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt\Parameters]. “LayerDriver JPN”=”kbd101.dll”. …
- Most searched keywords: Whether you are looking for Registry patch to change keyboard layout to 101-en-us · GitHub Windows Registry Editor Version 5.00. [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt\Parameters]. “LayerDriver JPN”=”kbd101.dll”. Registry patch to change keyboard layout to 101-en-us – keyboard_en_us.reg
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How to generate a complete memory dump
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How to generate a complete memory dump
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\i8042prt\Parameters, create a value named CrashOnCtrlScroll, and set it equal to a REG_DWORD value of … … - Most searched keywords: Whether you are looking for
How to generate a complete memory dump
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\i8042prt\Parameters, create a value named CrashOnCtrlScroll, and set it equal to a REG_DWORD value of … This article describes steps that lead to setting up and collecting a complete memory dump. - Table of Contents:
DCX
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- Summary of article content: Articles about DCX [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\i8042prt\Parameters] DWORD: CrashOnCtrlScroll=1. For USB keyboards: (Available in Windows Vista and … …
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Q102989: Device Driver Entries, PART 2–Mouse/Keyboard Driver | KnowledgeBase Archive
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- Summary of article content: Articles about Q102989: Device Driver Entries, PART 2–Mouse/Keyboard Driver | KnowledgeBase Archive These value entries are found in the following subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt\Parameters KeyboardDataQueueSize … …
- Most searched keywords: Whether you are looking for Q102989: Device Driver Entries, PART 2–Mouse/Keyboard Driver | KnowledgeBase Archive These value entries are found in the following subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt\Parameters KeyboardDataQueueSize … An Archive of Early Microsoft KnowledgeBase Articles
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An Archive of Early Microsoft KnowledgeBase Articles
Q102989 Device Driver Entries PART 2–MouseKeyboard Driver
The following boot-start or system-start driver(s) failed to load: i8042prt
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The following boot-start or system-start driver(s) failed to load: i8042prt
Navigator to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\i8042prt\Parameters in Registry Editor;; Add a new REG_DWORD “Headless” and set the value to 1 … … - Most searched keywords: Whether you are looking for
The following boot-start or system-start driver(s) failed to load: i8042prt
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PS/2 (i8042prt) driver – Windows drivers
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PS/2 (i8042prt) driver
Article
12/15/2021
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In this article
This topic describes the features of I8042prt, the Microsoft Windows 2000 and later system function driver for PS/2-style keyboard and mouse devices.
I8042prt implements the I8042prt service and its executable image is i8042prt.sys.
The features of I8042prt include:
Registry settings associated with the PS/2 driver
The following is a list of registry keys associated with the PS/2 port driver.
[Key: HKLM\SYSTEM\CurrentControlSet\Services\i8042prt\Parameters]EnableWheelDetection [REG_DWORD] – Determines whether the driver attempts to detect and enable the wheel on the mouse device. Some devices are equipped with a mouse wheel to provide rapid scrolling and other control features if supported by an application.
ResendIterations [REG_DWORD] – Specifies the maximum number of times a hardware operation is attempted. If the number of trials exceeds the value of this entry, Windows considers the operation to have failed.
NumberOfButtons [REG_DWORD] – Specifies the number of buttons on the mouse-port mouse at startup. If the number of buttons detected at startup is incorrect, you can override it by changing the value of this entry.
KeyboardDataQueueSize [REG_DWORD] – Specifies the number of keyboard events that the keyboard driver buffers. This entry is also used in calculating the size of the keyboard driver’s internal buffer in nonpaged memory pool. To determine the number of bytes to allocate for the buffer, the system multiplies the size of the KEYBOARD_INPUT_DATA structure by the value of KeyboardDataQueueSize.
PollStatusIterations [REG_DWORD] – Specifies the maximum number of times the system verifies interrupts on the i8042 controller status register. If the interrupt cannot be verified in the number of trials specified in the value of this entry, the interrupt is ignored.
PollingIterations [REG_DWORD] – Specifies the maximum number of times Windows 2000 polls the hardware. If the number of trials specified in this entry is exceeded, Windows 2000 stops polling.
SampleRate [REG_DWORD] – Specifies how often the PS/2 driver measures the characteristics and activities of the PS/2 mouse. The driver uses the information gathered through sampling to optimize the operation of the mouse device.
PollingIterationsMaximum [REG_DWORD] – Specifies the maximum number of times Windows 2000 polls the hardware on older-style AT keyboards. If the number of trials specified in this entry is exceeded, Windows stops polling.
MouseResendStallTime [REG_DWORD] – Determines how long the mouse driver waits for an acknowledgement (ACK) of a reset if a RESEND message is returned without an ACK. This entry is used when the mouse driver interrupt service routine includes a reset.
OverrideKeyboardType [REG_DWORD] – Specifies the keyboard type. You can add this entry to the registry to correct an error in the keyboard type detected at startup.
OverrideKeyboardSubtype [REG_DWORD] – Specifies the OEM-dependent keyboard subtype. You can add this entry to the registry to correct an error in the keyboard subtype detected at startup.
For additional information, please see:
Why, after I updated my keyboard driver to the new Microsoft Natural Keyboard Pro driver, did my keyboard and mouse stop working?
A. The latest Natural Keyboard Pro driver supports only the keyboard’s USB socket (even though the keyboard also has a PS/2 connection). When installing the new driver, the setup program disables the i8042 port and enables Human Interface Device (HID) support. The i8042 service must be running for a PS/2 keyboard and mouse to function.
Unless you can log on (which, unless you have enabled autologon, might be impossible), try booting into the Last Known Good configuration by pressing F8 at the boot menu to undo the change. If the Last Known Good configuration doesn’t resolve the problem, you can change the following registry values remotely or by using third-party tools:
Change HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt\Start to 1
Change HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\kbdhid\Start to 4
If you can’t edit these registry settings, you need to use the Recovery Console (RC) by performing the following steps:
2 Mouse Port Driver (i8042prt) Service Defaults in Windows 10
I8042 Keyboard and PS/2 Mouse Port Driver (i8042prt) Service Defaults in Windows 10
i8042 Port Driver by Microsoft Corporation.
Default Settings
Startup type: Manual Display name: I8042 Keyboard and PS/2 Mouse Port Driver Service name: i8042prt Service type: kernel Error control: normal Group: Keyboard Port Path: %SystemRoot%\System32\drivers\i8042prt.sys Registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt
Default Behavior
I8042 Keyboard and PS/2 Mouse Port Driver is a kernel device driver. In Windows 10 it is starting only if the user, an application or another service starts it. If I8042 Keyboard and PS/2 Mouse Port Driver fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the i8042prt service has failed to start due to the error.
Restore Default Startup Configuration of I8042 Keyboard and PS/2 Mouse Port Driver
1. Run the Command Prompt as an administrator.
2. Copy the command below, paste it into the command window and press ENTER:
sc config i8042prt start= demand
3. Close the command window and restart the computer.
The i8042prt service is using the i8042prt.sys file that is located in the %WinDir%\System32\drivers folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 10 installation media.
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